1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/macros.hpp" 42 #include "utilities/taskqueue.hpp" 43 #ifdef TARGET_OS_FAMILY_linux 44 # include "os_linux.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_solaris 47 # include "os_solaris.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_windows 50 # include "os_windows.inline.hpp" 51 #endif 52 #ifdef TARGET_OS_FAMILY_bsd 53 # include "os_bsd.inline.hpp" 54 #endif 55 #if INCLUDE_ALL_GCS 56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 57 #endif // INCLUDE_ALL_GCS 58 59 // Note: This is a special bug reporting site for the JVM 60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 61 #define DEFAULT_JAVA_LAUNCHER "generic" 62 63 char** Arguments::_jvm_flags_array = NULL; 64 int Arguments::_num_jvm_flags = 0; 65 char** Arguments::_jvm_args_array = NULL; 66 int Arguments::_num_jvm_args = 0; 67 char* Arguments::_java_command = NULL; 68 SystemProperty* Arguments::_system_properties = NULL; 69 const char* Arguments::_gc_log_filename = NULL; 70 bool Arguments::_has_profile = false; 71 uintx Arguments::_min_heap_size = 0; 72 Arguments::Mode Arguments::_mode = _mixed; 73 bool Arguments::_java_compiler = false; 74 bool Arguments::_xdebug_mode = false; 75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 77 int Arguments::_sun_java_launcher_pid = -1; 78 bool Arguments::_created_by_gamma_launcher = false; 79 80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 83 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 84 bool Arguments::_ClipInlining = ClipInlining; 85 86 char* Arguments::SharedArchivePath = NULL; 87 88 AgentLibraryList Arguments::_libraryList; 89 AgentLibraryList Arguments::_agentList; 90 91 abort_hook_t Arguments::_abort_hook = NULL; 92 exit_hook_t Arguments::_exit_hook = NULL; 93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 94 95 96 SystemProperty *Arguments::_java_ext_dirs = NULL; 97 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 98 SystemProperty *Arguments::_sun_boot_library_path = NULL; 99 SystemProperty *Arguments::_java_library_path = NULL; 100 SystemProperty *Arguments::_java_home = NULL; 101 SystemProperty *Arguments::_java_class_path = NULL; 102 SystemProperty *Arguments::_sun_boot_class_path = NULL; 103 104 char* Arguments::_meta_index_path = NULL; 105 char* Arguments::_meta_index_dir = NULL; 106 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 108 109 static bool match_option(const JavaVMOption *option, const char* name, 110 const char** tail) { 111 int len = (int)strlen(name); 112 if (strncmp(option->optionString, name, len) == 0) { 113 *tail = option->optionString + len; 114 return true; 115 } else { 116 return false; 117 } 118 } 119 120 static void logOption(const char* opt) { 121 if (PrintVMOptions) { 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 123 } 124 } 125 126 // Process java launcher properties. 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 128 // See if sun.java.launcher or sun.java.launcher.pid is defined. 129 // Must do this before setting up other system properties, 130 // as some of them may depend on launcher type. 131 for (int index = 0; index < args->nOptions; index++) { 132 const JavaVMOption* option = args->options + index; 133 const char* tail; 134 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 136 process_java_launcher_argument(tail, option->extraInfo); 137 continue; 138 } 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 140 _sun_java_launcher_pid = atoi(tail); 141 continue; 142 } 143 } 144 } 145 146 // Initialize system properties key and value. 147 void Arguments::init_system_properties() { 148 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 150 "Java Virtual Machine Specification", false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 154 155 // following are JVMTI agent writeable properties. 156 // Properties values are set to NULL and they are 157 // os specific they are initialized in os::init_system_properties_values(). 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 161 _java_library_path = new SystemProperty("java.library.path", NULL, true); 162 _java_home = new SystemProperty("java.home", NULL, true); 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 164 165 _java_class_path = new SystemProperty("java.class.path", "", true); 166 167 // Add to System Property list. 168 PropertyList_add(&_system_properties, _java_ext_dirs); 169 PropertyList_add(&_system_properties, _java_endorsed_dirs); 170 PropertyList_add(&_system_properties, _sun_boot_library_path); 171 PropertyList_add(&_system_properties, _java_library_path); 172 PropertyList_add(&_system_properties, _java_home); 173 PropertyList_add(&_system_properties, _java_class_path); 174 PropertyList_add(&_system_properties, _sun_boot_class_path); 175 176 // Set OS specific system properties values 177 os::init_system_properties_values(); 178 } 179 180 181 // Update/Initialize System properties after JDK version number is known 182 void Arguments::init_version_specific_system_properties() { 183 enum { bufsz = 16 }; 184 char buffer[bufsz]; 185 const char* spec_vendor = "Sun Microsystems Inc."; 186 uint32_t spec_version = 0; 187 188 if (JDK_Version::is_gte_jdk17x_version()) { 189 spec_vendor = "Oracle Corporation"; 190 spec_version = JDK_Version::current().major_version(); 191 } 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 193 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.specification.version", buffer, false)); 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 200 } 201 202 /** 203 * Provide a slightly more user-friendly way of eliminating -XX flags. 204 * When a flag is eliminated, it can be added to this list in order to 205 * continue accepting this flag on the command-line, while issuing a warning 206 * and ignoring the value. Once the JDK version reaches the 'accept_until' 207 * limit, we flatly refuse to admit the existence of the flag. This allows 208 * a flag to die correctly over JDK releases using HSX. 209 */ 210 typedef struct { 211 const char* name; 212 JDK_Version obsoleted_in; // when the flag went away 213 JDK_Version accept_until; // which version to start denying the existence 214 } ObsoleteFlag; 215 216 static ObsoleteFlag obsolete_jvm_flags[] = { 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "DefaultInitialRAMFraction", 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 234 { "UseDepthFirstScavengeOrder", 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 236 { "HandlePromotionFailure", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "MaxLiveObjectEvacuationRatio", 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 241 { "UseParallelOldGCCompacting", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelDensePrefixUpdate", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "UseParallelOldGCDensePrefix", 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 263 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 264 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 265 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 266 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 267 #ifdef PRODUCT 268 { "DesiredMethodLimit", 269 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 270 #endif // PRODUCT 271 { NULL, JDK_Version(0), JDK_Version(0) } 272 }; 273 274 // Returns true if the flag is obsolete and fits into the range specified 275 // for being ignored. In the case that the flag is ignored, the 'version' 276 // value is filled in with the version number when the flag became 277 // obsolete so that that value can be displayed to the user. 278 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 279 int i = 0; 280 assert(version != NULL, "Must provide a version buffer"); 281 while (obsolete_jvm_flags[i].name != NULL) { 282 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 283 // <flag>=xxx form 284 // [-|+]<flag> form 285 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 286 ((s[0] == '+' || s[0] == '-') && 287 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 288 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 289 *version = flag_status.obsoleted_in; 290 return true; 291 } 292 } 293 i++; 294 } 295 return false; 296 } 297 298 // Constructs the system class path (aka boot class path) from the following 299 // components, in order: 300 // 301 // prefix // from -Xbootclasspath/p:... 302 // endorsed // the expansion of -Djava.endorsed.dirs=... 303 // base // from os::get_system_properties() or -Xbootclasspath= 304 // suffix // from -Xbootclasspath/a:... 305 // 306 // java.endorsed.dirs is a list of directories; any jar or zip files in the 307 // directories are added to the sysclasspath just before the base. 308 // 309 // This could be AllStatic, but it isn't needed after argument processing is 310 // complete. 311 class SysClassPath: public StackObj { 312 public: 313 SysClassPath(const char* base); 314 ~SysClassPath(); 315 316 inline void set_base(const char* base); 317 inline void add_prefix(const char* prefix); 318 inline void add_suffix_to_prefix(const char* suffix); 319 inline void add_suffix(const char* suffix); 320 inline void reset_path(const char* base); 321 322 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 323 // property. Must be called after all command-line arguments have been 324 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 325 // combined_path(). 326 void expand_endorsed(); 327 328 inline const char* get_base() const { return _items[_scp_base]; } 329 inline const char* get_prefix() const { return _items[_scp_prefix]; } 330 inline const char* get_suffix() const { return _items[_scp_suffix]; } 331 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 332 333 // Combine all the components into a single c-heap-allocated string; caller 334 // must free the string if/when no longer needed. 335 char* combined_path(); 336 337 private: 338 // Utility routines. 339 static char* add_to_path(const char* path, const char* str, bool prepend); 340 static char* add_jars_to_path(char* path, const char* directory); 341 342 inline void reset_item_at(int index); 343 344 // Array indices for the items that make up the sysclasspath. All except the 345 // base are allocated in the C heap and freed by this class. 346 enum { 347 _scp_prefix, // from -Xbootclasspath/p:... 348 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 349 _scp_base, // the default sysclasspath 350 _scp_suffix, // from -Xbootclasspath/a:... 351 _scp_nitems // the number of items, must be last. 352 }; 353 354 const char* _items[_scp_nitems]; 355 DEBUG_ONLY(bool _expansion_done;) 356 }; 357 358 SysClassPath::SysClassPath(const char* base) { 359 memset(_items, 0, sizeof(_items)); 360 _items[_scp_base] = base; 361 DEBUG_ONLY(_expansion_done = false;) 362 } 363 364 SysClassPath::~SysClassPath() { 365 // Free everything except the base. 366 for (int i = 0; i < _scp_nitems; ++i) { 367 if (i != _scp_base) reset_item_at(i); 368 } 369 DEBUG_ONLY(_expansion_done = false;) 370 } 371 372 inline void SysClassPath::set_base(const char* base) { 373 _items[_scp_base] = base; 374 } 375 376 inline void SysClassPath::add_prefix(const char* prefix) { 377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 378 } 379 380 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 381 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 382 } 383 384 inline void SysClassPath::add_suffix(const char* suffix) { 385 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 386 } 387 388 inline void SysClassPath::reset_item_at(int index) { 389 assert(index < _scp_nitems && index != _scp_base, "just checking"); 390 if (_items[index] != NULL) { 391 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 392 _items[index] = NULL; 393 } 394 } 395 396 inline void SysClassPath::reset_path(const char* base) { 397 // Clear the prefix and suffix. 398 reset_item_at(_scp_prefix); 399 reset_item_at(_scp_suffix); 400 set_base(base); 401 } 402 403 //------------------------------------------------------------------------------ 404 405 void SysClassPath::expand_endorsed() { 406 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 407 408 const char* path = Arguments::get_property("java.endorsed.dirs"); 409 if (path == NULL) { 410 path = Arguments::get_endorsed_dir(); 411 assert(path != NULL, "no default for java.endorsed.dirs"); 412 } 413 414 char* expanded_path = NULL; 415 const char separator = *os::path_separator(); 416 const char* const end = path + strlen(path); 417 while (path < end) { 418 const char* tmp_end = strchr(path, separator); 419 if (tmp_end == NULL) { 420 expanded_path = add_jars_to_path(expanded_path, path); 421 path = end; 422 } else { 423 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 424 memcpy(dirpath, path, tmp_end - path); 425 dirpath[tmp_end - path] = '\0'; 426 expanded_path = add_jars_to_path(expanded_path, dirpath); 427 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 428 path = tmp_end + 1; 429 } 430 } 431 _items[_scp_endorsed] = expanded_path; 432 DEBUG_ONLY(_expansion_done = true;) 433 } 434 435 // Combine the bootclasspath elements, some of which may be null, into a single 436 // c-heap-allocated string. 437 char* SysClassPath::combined_path() { 438 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 439 assert(_expansion_done, "must call expand_endorsed() first."); 440 441 size_t lengths[_scp_nitems]; 442 size_t total_len = 0; 443 444 const char separator = *os::path_separator(); 445 446 // Get the lengths. 447 int i; 448 for (i = 0; i < _scp_nitems; ++i) { 449 if (_items[i] != NULL) { 450 lengths[i] = strlen(_items[i]); 451 // Include space for the separator char (or a NULL for the last item). 452 total_len += lengths[i] + 1; 453 } 454 } 455 assert(total_len > 0, "empty sysclasspath not allowed"); 456 457 // Copy the _items to a single string. 458 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 459 char* cp_tmp = cp; 460 for (i = 0; i < _scp_nitems; ++i) { 461 if (_items[i] != NULL) { 462 memcpy(cp_tmp, _items[i], lengths[i]); 463 cp_tmp += lengths[i]; 464 *cp_tmp++ = separator; 465 } 466 } 467 *--cp_tmp = '\0'; // Replace the extra separator. 468 return cp; 469 } 470 471 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 472 char* 473 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 474 char *cp; 475 476 assert(str != NULL, "just checking"); 477 if (path == NULL) { 478 size_t len = strlen(str) + 1; 479 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 480 memcpy(cp, str, len); // copy the trailing null 481 } else { 482 const char separator = *os::path_separator(); 483 size_t old_len = strlen(path); 484 size_t str_len = strlen(str); 485 size_t len = old_len + str_len + 2; 486 487 if (prepend) { 488 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 489 char* cp_tmp = cp; 490 memcpy(cp_tmp, str, str_len); 491 cp_tmp += str_len; 492 *cp_tmp = separator; 493 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 494 FREE_C_HEAP_ARRAY(char, path, mtInternal); 495 } else { 496 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 497 char* cp_tmp = cp + old_len; 498 *cp_tmp = separator; 499 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 500 } 501 } 502 return cp; 503 } 504 505 // Scan the directory and append any jar or zip files found to path. 506 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 507 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 508 DIR* dir = os::opendir(directory); 509 if (dir == NULL) return path; 510 511 char dir_sep[2] = { '\0', '\0' }; 512 size_t directory_len = strlen(directory); 513 const char fileSep = *os::file_separator(); 514 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 515 516 /* Scan the directory for jars/zips, appending them to path. */ 517 struct dirent *entry; 518 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 519 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 520 const char* name = entry->d_name; 521 const char* ext = name + strlen(name) - 4; 522 bool isJarOrZip = ext > name && 523 (os::file_name_strcmp(ext, ".jar") == 0 || 524 os::file_name_strcmp(ext, ".zip") == 0); 525 if (isJarOrZip) { 526 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 527 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 528 path = add_to_path(path, jarpath, false); 529 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 530 } 531 } 532 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 533 os::closedir(dir); 534 return path; 535 } 536 537 // Parses a memory size specification string. 538 static bool atomull(const char *s, julong* result) { 539 julong n = 0; 540 int args_read = sscanf(s, JULONG_FORMAT, &n); 541 if (args_read != 1) { 542 return false; 543 } 544 while (*s != '\0' && isdigit(*s)) { 545 s++; 546 } 547 // 4705540: illegal if more characters are found after the first non-digit 548 if (strlen(s) > 1) { 549 return false; 550 } 551 switch (*s) { 552 case 'T': case 't': 553 *result = n * G * K; 554 // Check for overflow. 555 if (*result/((julong)G * K) != n) return false; 556 return true; 557 case 'G': case 'g': 558 *result = n * G; 559 if (*result/G != n) return false; 560 return true; 561 case 'M': case 'm': 562 *result = n * M; 563 if (*result/M != n) return false; 564 return true; 565 case 'K': case 'k': 566 *result = n * K; 567 if (*result/K != n) return false; 568 return true; 569 case '\0': 570 *result = n; 571 return true; 572 default: 573 return false; 574 } 575 } 576 577 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 578 if (size < min_size) return arg_too_small; 579 // Check that size will fit in a size_t (only relevant on 32-bit) 580 if (size > max_uintx) return arg_too_big; 581 return arg_in_range; 582 } 583 584 // Describe an argument out of range error 585 void Arguments::describe_range_error(ArgsRange errcode) { 586 switch(errcode) { 587 case arg_too_big: 588 jio_fprintf(defaultStream::error_stream(), 589 "The specified size exceeds the maximum " 590 "representable size.\n"); 591 break; 592 case arg_too_small: 593 case arg_unreadable: 594 case arg_in_range: 595 // do nothing for now 596 break; 597 default: 598 ShouldNotReachHere(); 599 } 600 } 601 602 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 603 return CommandLineFlags::boolAtPut(name, &value, origin); 604 } 605 606 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 607 double v; 608 if (sscanf(value, "%lf", &v) != 1) { 609 return false; 610 } 611 612 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 613 return true; 614 } 615 return false; 616 } 617 618 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 619 julong v; 620 intx intx_v; 621 bool is_neg = false; 622 // Check the sign first since atomull() parses only unsigned values. 623 if (*value == '-') { 624 if (!CommandLineFlags::intxAt(name, &intx_v)) { 625 return false; 626 } 627 value++; 628 is_neg = true; 629 } 630 if (!atomull(value, &v)) { 631 return false; 632 } 633 intx_v = (intx) v; 634 if (is_neg) { 635 intx_v = -intx_v; 636 } 637 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 638 return true; 639 } 640 uintx uintx_v = (uintx) v; 641 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 642 return true; 643 } 644 uint64_t uint64_t_v = (uint64_t) v; 645 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 646 return true; 647 } 648 return false; 649 } 650 651 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 652 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 653 // Contract: CommandLineFlags always returns a pointer that needs freeing. 654 FREE_C_HEAP_ARRAY(char, value, mtInternal); 655 return true; 656 } 657 658 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 659 const char* old_value = ""; 660 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 661 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 662 size_t new_len = strlen(new_value); 663 const char* value; 664 char* free_this_too = NULL; 665 if (old_len == 0) { 666 value = new_value; 667 } else if (new_len == 0) { 668 value = old_value; 669 } else { 670 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 671 // each new setting adds another LINE to the switch: 672 sprintf(buf, "%s\n%s", old_value, new_value); 673 value = buf; 674 free_this_too = buf; 675 } 676 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 677 // CommandLineFlags always returns a pointer that needs freeing. 678 FREE_C_HEAP_ARRAY(char, value, mtInternal); 679 if (free_this_too != NULL) { 680 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 681 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 682 } 683 return true; 684 } 685 686 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 687 688 // range of acceptable characters spelled out for portability reasons 689 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 690 #define BUFLEN 255 691 char name[BUFLEN+1]; 692 char dummy; 693 694 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 695 return set_bool_flag(name, false, origin); 696 } 697 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 698 return set_bool_flag(name, true, origin); 699 } 700 701 char punct; 702 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 703 const char* value = strchr(arg, '=') + 1; 704 Flag* flag = Flag::find_flag(name, strlen(name)); 705 if (flag != NULL && flag->is_ccstr()) { 706 if (flag->ccstr_accumulates()) { 707 return append_to_string_flag(name, value, origin); 708 } else { 709 if (value[0] == '\0') { 710 value = NULL; 711 } 712 return set_string_flag(name, value, origin); 713 } 714 } 715 } 716 717 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 718 const char* value = strchr(arg, '=') + 1; 719 // -XX:Foo:=xxx will reset the string flag to the given value. 720 if (value[0] == '\0') { 721 value = NULL; 722 } 723 return set_string_flag(name, value, origin); 724 } 725 726 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 727 #define SIGNED_NUMBER_RANGE "[-0123456789]" 728 #define NUMBER_RANGE "[0123456789]" 729 char value[BUFLEN + 1]; 730 char value2[BUFLEN + 1]; 731 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 732 // Looks like a floating-point number -- try again with more lenient format string 733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 734 return set_fp_numeric_flag(name, value, origin); 735 } 736 } 737 738 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 740 return set_numeric_flag(name, value, origin); 741 } 742 743 return false; 744 } 745 746 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 747 assert(bldarray != NULL, "illegal argument"); 748 749 if (arg == NULL) { 750 return; 751 } 752 753 int new_count = *count + 1; 754 755 // expand the array and add arg to the last element 756 if (*bldarray == NULL) { 757 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 758 } else { 759 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 760 } 761 (*bldarray)[*count] = strdup(arg); 762 *count = new_count; 763 } 764 765 void Arguments::build_jvm_args(const char* arg) { 766 add_string(&_jvm_args_array, &_num_jvm_args, arg); 767 } 768 769 void Arguments::build_jvm_flags(const char* arg) { 770 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 771 } 772 773 // utility function to return a string that concatenates all 774 // strings in a given char** array 775 const char* Arguments::build_resource_string(char** args, int count) { 776 if (args == NULL || count == 0) { 777 return NULL; 778 } 779 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 780 for (int i = 1; i < count; i++) { 781 length += strlen(args[i]) + 1; // add 1 for a space 782 } 783 char* s = NEW_RESOURCE_ARRAY(char, length); 784 strcpy(s, args[0]); 785 for (int j = 1; j < count; j++) { 786 strcat(s, " "); 787 strcat(s, args[j]); 788 } 789 return (const char*) s; 790 } 791 792 void Arguments::print_on(outputStream* st) { 793 st->print_cr("VM Arguments:"); 794 if (num_jvm_flags() > 0) { 795 st->print("jvm_flags: "); print_jvm_flags_on(st); 796 } 797 if (num_jvm_args() > 0) { 798 st->print("jvm_args: "); print_jvm_args_on(st); 799 } 800 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 801 if (_java_class_path != NULL) { 802 char* path = _java_class_path->value(); 803 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 804 } 805 st->print_cr("Launcher Type: %s", _sun_java_launcher); 806 } 807 808 void Arguments::print_jvm_flags_on(outputStream* st) { 809 if (_num_jvm_flags > 0) { 810 for (int i=0; i < _num_jvm_flags; i++) { 811 st->print("%s ", _jvm_flags_array[i]); 812 } 813 st->print_cr(""); 814 } 815 } 816 817 void Arguments::print_jvm_args_on(outputStream* st) { 818 if (_num_jvm_args > 0) { 819 for (int i=0; i < _num_jvm_args; i++) { 820 st->print("%s ", _jvm_args_array[i]); 821 } 822 st->print_cr(""); 823 } 824 } 825 826 bool Arguments::process_argument(const char* arg, 827 jboolean ignore_unrecognized, FlagValueOrigin origin) { 828 829 JDK_Version since = JDK_Version(); 830 831 if (parse_argument(arg, origin) || ignore_unrecognized) { 832 return true; 833 } 834 835 bool has_plus_minus = (*arg == '+' || *arg == '-'); 836 const char* const argname = has_plus_minus ? arg + 1 : arg; 837 if (is_newly_obsolete(arg, &since)) { 838 char version[256]; 839 since.to_string(version, sizeof(version)); 840 warning("ignoring option %s; support was removed in %s", argname, version); 841 return true; 842 } 843 844 // For locked flags, report a custom error message if available. 845 // Otherwise, report the standard unrecognized VM option. 846 847 size_t arg_len; 848 const char* equal_sign = strchr(argname, '='); 849 if (equal_sign == NULL) { 850 arg_len = strlen(argname); 851 } else { 852 arg_len = equal_sign - argname; 853 } 854 855 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 856 if (found_flag != NULL) { 857 char locked_message_buf[BUFLEN]; 858 found_flag->get_locked_message(locked_message_buf, BUFLEN); 859 if (strlen(locked_message_buf) == 0) { 860 if (found_flag->is_bool() && !has_plus_minus) { 861 jio_fprintf(defaultStream::error_stream(), 862 "Missing +/- setting for VM option '%s'\n", argname); 863 } else if (!found_flag->is_bool() && has_plus_minus) { 864 jio_fprintf(defaultStream::error_stream(), 865 "Unexpected +/- setting in VM option '%s'\n", argname); 866 } else { 867 jio_fprintf(defaultStream::error_stream(), 868 "Improperly specified VM option '%s'\n", argname); 869 } 870 } else { 871 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 872 } 873 } else { 874 jio_fprintf(defaultStream::error_stream(), 875 "Unrecognized VM option '%s'\n", argname); 876 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 877 if (fuzzy_matched != NULL) { 878 jio_fprintf(defaultStream::error_stream(), 879 "Did you mean '%s%s%s'?\n", 880 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 881 fuzzy_matched->name, 882 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 883 } 884 } 885 886 // allow for commandline "commenting out" options like -XX:#+Verbose 887 return arg[0] == '#'; 888 } 889 890 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 891 FILE* stream = fopen(file_name, "rb"); 892 if (stream == NULL) { 893 if (should_exist) { 894 jio_fprintf(defaultStream::error_stream(), 895 "Could not open settings file %s\n", file_name); 896 return false; 897 } else { 898 return true; 899 } 900 } 901 902 char token[1024]; 903 int pos = 0; 904 905 bool in_white_space = true; 906 bool in_comment = false; 907 bool in_quote = false; 908 char quote_c = 0; 909 bool result = true; 910 911 int c = getc(stream); 912 while(c != EOF && pos < (int)(sizeof(token)-1)) { 913 if (in_white_space) { 914 if (in_comment) { 915 if (c == '\n') in_comment = false; 916 } else { 917 if (c == '#') in_comment = true; 918 else if (!isspace(c)) { 919 in_white_space = false; 920 token[pos++] = c; 921 } 922 } 923 } else { 924 if (c == '\n' || (!in_quote && isspace(c))) { 925 // token ends at newline, or at unquoted whitespace 926 // this allows a way to include spaces in string-valued options 927 token[pos] = '\0'; 928 logOption(token); 929 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 930 build_jvm_flags(token); 931 pos = 0; 932 in_white_space = true; 933 in_quote = false; 934 } else if (!in_quote && (c == '\'' || c == '"')) { 935 in_quote = true; 936 quote_c = c; 937 } else if (in_quote && (c == quote_c)) { 938 in_quote = false; 939 } else { 940 token[pos++] = c; 941 } 942 } 943 c = getc(stream); 944 } 945 if (pos > 0) { 946 token[pos] = '\0'; 947 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 948 build_jvm_flags(token); 949 } 950 fclose(stream); 951 return result; 952 } 953 954 //============================================================================================================= 955 // Parsing of properties (-D) 956 957 const char* Arguments::get_property(const char* key) { 958 return PropertyList_get_value(system_properties(), key); 959 } 960 961 bool Arguments::add_property(const char* prop) { 962 const char* eq = strchr(prop, '='); 963 char* key; 964 // ns must be static--its address may be stored in a SystemProperty object. 965 const static char ns[1] = {0}; 966 char* value = (char *)ns; 967 968 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 969 key = AllocateHeap(key_len + 1, mtInternal); 970 strncpy(key, prop, key_len); 971 key[key_len] = '\0'; 972 973 if (eq != NULL) { 974 size_t value_len = strlen(prop) - key_len - 1; 975 value = AllocateHeap(value_len + 1, mtInternal); 976 strncpy(value, &prop[key_len + 1], value_len + 1); 977 } 978 979 if (strcmp(key, "java.compiler") == 0) { 980 process_java_compiler_argument(value); 981 FreeHeap(key); 982 if (eq != NULL) { 983 FreeHeap(value); 984 } 985 return true; 986 } else if (strcmp(key, "sun.java.command") == 0) { 987 _java_command = value; 988 989 // Record value in Arguments, but let it get passed to Java. 990 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 991 // launcher.pid property is private and is processed 992 // in process_sun_java_launcher_properties(); 993 // the sun.java.launcher property is passed on to the java application 994 FreeHeap(key); 995 if (eq != NULL) { 996 FreeHeap(value); 997 } 998 return true; 999 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1000 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1001 // its value without going through the property list or making a Java call. 1002 _java_vendor_url_bug = value; 1003 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1004 PropertyList_unique_add(&_system_properties, key, value, true); 1005 return true; 1006 } 1007 // Create new property and add at the end of the list 1008 PropertyList_unique_add(&_system_properties, key, value); 1009 return true; 1010 } 1011 1012 //=========================================================================================================== 1013 // Setting int/mixed/comp mode flags 1014 1015 void Arguments::set_mode_flags(Mode mode) { 1016 // Set up default values for all flags. 1017 // If you add a flag to any of the branches below, 1018 // add a default value for it here. 1019 set_java_compiler(false); 1020 _mode = mode; 1021 1022 // Ensure Agent_OnLoad has the correct initial values. 1023 // This may not be the final mode; mode may change later in onload phase. 1024 PropertyList_unique_add(&_system_properties, "java.vm.info", 1025 (char*)VM_Version::vm_info_string(), false); 1026 1027 UseInterpreter = true; 1028 UseCompiler = true; 1029 UseLoopCounter = true; 1030 1031 #ifndef ZERO 1032 // Turn these off for mixed and comp. Leave them on for Zero. 1033 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1034 UseFastAccessorMethods = (mode == _int); 1035 } 1036 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1037 UseFastEmptyMethods = (mode == _int); 1038 } 1039 #endif 1040 1041 // Default values may be platform/compiler dependent - 1042 // use the saved values 1043 ClipInlining = Arguments::_ClipInlining; 1044 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1045 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1046 BackgroundCompilation = Arguments::_BackgroundCompilation; 1047 1048 // Change from defaults based on mode 1049 switch (mode) { 1050 default: 1051 ShouldNotReachHere(); 1052 break; 1053 case _int: 1054 UseCompiler = false; 1055 UseLoopCounter = false; 1056 AlwaysCompileLoopMethods = false; 1057 UseOnStackReplacement = false; 1058 break; 1059 case _mixed: 1060 // same as default 1061 break; 1062 case _comp: 1063 UseInterpreter = false; 1064 BackgroundCompilation = false; 1065 ClipInlining = false; 1066 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1067 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1068 // compile a level 4 (C2) and then continue executing it. 1069 if (TieredCompilation) { 1070 Tier3InvokeNotifyFreqLog = 0; 1071 Tier4InvocationThreshold = 0; 1072 } 1073 break; 1074 } 1075 } 1076 1077 // Conflict: required to use shared spaces (-Xshare:on), but 1078 // incompatible command line options were chosen. 1079 1080 static void no_shared_spaces() { 1081 if (RequireSharedSpaces) { 1082 jio_fprintf(defaultStream::error_stream(), 1083 "Class data sharing is inconsistent with other specified options.\n"); 1084 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1085 } else { 1086 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1087 } 1088 } 1089 1090 void Arguments::set_tiered_flags() { 1091 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1092 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1093 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1094 } 1095 if (CompilationPolicyChoice < 2) { 1096 vm_exit_during_initialization( 1097 "Incompatible compilation policy selected", NULL); 1098 } 1099 // Increase the code cache size - tiered compiles a lot more. 1100 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1101 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1102 } 1103 if (!UseInterpreter) { // -Xcomp 1104 Tier3InvokeNotifyFreqLog = 0; 1105 Tier4InvocationThreshold = 0; 1106 } 1107 } 1108 1109 #if INCLUDE_ALL_GCS 1110 static void disable_adaptive_size_policy(const char* collector_name) { 1111 if (UseAdaptiveSizePolicy) { 1112 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1113 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1114 collector_name); 1115 } 1116 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1117 } 1118 } 1119 1120 void Arguments::set_parnew_gc_flags() { 1121 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1122 "control point invariant"); 1123 assert(UseParNewGC, "Error"); 1124 1125 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1126 disable_adaptive_size_policy("UseParNewGC"); 1127 1128 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1129 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1130 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1131 } else if (ParallelGCThreads == 0) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1134 vm_exit(1); 1135 } 1136 1137 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1138 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1139 // we set them to 1024 and 1024. 1140 // See CR 6362902. 1141 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1142 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1143 } 1144 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1145 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1146 } 1147 1148 // AlwaysTenure flag should make ParNew promote all at first collection. 1149 // See CR 6362902. 1150 if (AlwaysTenure) { 1151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1152 } 1153 // When using compressed oops, we use local overflow stacks, 1154 // rather than using a global overflow list chained through 1155 // the klass word of the object's pre-image. 1156 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1157 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1158 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1159 } 1160 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1161 } 1162 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1163 } 1164 1165 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1166 // sparc/solaris for certain applications, but would gain from 1167 // further optimization and tuning efforts, and would almost 1168 // certainly gain from analysis of platform and environment. 1169 void Arguments::set_cms_and_parnew_gc_flags() { 1170 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1171 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1172 1173 // If we are using CMS, we prefer to UseParNewGC, 1174 // unless explicitly forbidden. 1175 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1176 FLAG_SET_ERGO(bool, UseParNewGC, true); 1177 } 1178 1179 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1180 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1181 1182 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1183 // as needed. 1184 if (UseParNewGC) { 1185 set_parnew_gc_flags(); 1186 } 1187 1188 size_t max_heap = align_size_down(MaxHeapSize, 1189 CardTableRS::ct_max_alignment_constraint()); 1190 1191 // Now make adjustments for CMS 1192 intx tenuring_default = (intx)6; 1193 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1194 1195 // Preferred young gen size for "short" pauses: 1196 // upper bound depends on # of threads and NewRatio. 1197 const uintx parallel_gc_threads = 1198 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1199 const size_t preferred_max_new_size_unaligned = 1200 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1201 size_t preferred_max_new_size = 1202 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1203 1204 // Unless explicitly requested otherwise, size young gen 1205 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1206 1207 // If either MaxNewSize or NewRatio is set on the command line, 1208 // assume the user is trying to set the size of the young gen. 1209 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1210 1211 // Set MaxNewSize to our calculated preferred_max_new_size unless 1212 // NewSize was set on the command line and it is larger than 1213 // preferred_max_new_size. 1214 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1215 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1216 } else { 1217 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1218 } 1219 if (PrintGCDetails && Verbose) { 1220 // Too early to use gclog_or_tty 1221 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1222 } 1223 1224 // Code along this path potentially sets NewSize and OldSize 1225 if (PrintGCDetails && Verbose) { 1226 // Too early to use gclog_or_tty 1227 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1228 " initial_heap_size: " SIZE_FORMAT 1229 " max_heap: " SIZE_FORMAT, 1230 min_heap_size(), InitialHeapSize, max_heap); 1231 } 1232 size_t min_new = preferred_max_new_size; 1233 if (FLAG_IS_CMDLINE(NewSize)) { 1234 min_new = NewSize; 1235 } 1236 if (max_heap > min_new && min_heap_size() > min_new) { 1237 // Unless explicitly requested otherwise, make young gen 1238 // at least min_new, and at most preferred_max_new_size. 1239 if (FLAG_IS_DEFAULT(NewSize)) { 1240 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1241 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1242 if (PrintGCDetails && Verbose) { 1243 // Too early to use gclog_or_tty 1244 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1245 } 1246 } 1247 // Unless explicitly requested otherwise, size old gen 1248 // so it's NewRatio x of NewSize. 1249 if (FLAG_IS_DEFAULT(OldSize)) { 1250 if (max_heap > NewSize) { 1251 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1252 if (PrintGCDetails && Verbose) { 1253 // Too early to use gclog_or_tty 1254 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1255 } 1256 } 1257 } 1258 } 1259 } 1260 // Unless explicitly requested otherwise, definitely 1261 // promote all objects surviving "tenuring_default" scavenges. 1262 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1263 FLAG_IS_DEFAULT(SurvivorRatio)) { 1264 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1265 } 1266 // If we decided above (or user explicitly requested) 1267 // `promote all' (via MaxTenuringThreshold := 0), 1268 // prefer minuscule survivor spaces so as not to waste 1269 // space for (non-existent) survivors 1270 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1271 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1272 } 1273 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1274 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1275 // This is done in order to make ParNew+CMS configuration to work 1276 // with YoungPLABSize and OldPLABSize options. 1277 // See CR 6362902. 1278 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1279 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1280 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1281 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1282 // the value (either from the command line or ergonomics) of 1283 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1284 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1285 } else { 1286 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1287 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1288 // we'll let it to take precedence. 1289 jio_fprintf(defaultStream::error_stream(), 1290 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1291 " options are specified for the CMS collector." 1292 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1293 } 1294 } 1295 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1296 // OldPLAB sizing manually turned off: Use a larger default setting, 1297 // unless it was manually specified. This is because a too-low value 1298 // will slow down scavenges. 1299 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1300 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1301 } 1302 } 1303 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1304 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1305 // If either of the static initialization defaults have changed, note this 1306 // modification. 1307 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1308 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1309 } 1310 if (PrintGCDetails && Verbose) { 1311 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1312 MarkStackSize / K, MarkStackSizeMax / K); 1313 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1314 } 1315 } 1316 #endif // INCLUDE_ALL_GCS 1317 1318 void set_object_alignment() { 1319 // Object alignment. 1320 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1321 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1322 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1323 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1324 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1325 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1326 1327 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1328 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1329 1330 // Oop encoding heap max 1331 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1332 1333 #if INCLUDE_ALL_GCS 1334 // Set CMS global values 1335 CompactibleFreeListSpace::set_cms_values(); 1336 #endif // INCLUDE_ALL_GCS 1337 } 1338 1339 bool verify_object_alignment() { 1340 // Object alignment. 1341 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1342 jio_fprintf(defaultStream::error_stream(), 1343 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1344 (int)ObjectAlignmentInBytes); 1345 return false; 1346 } 1347 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1348 jio_fprintf(defaultStream::error_stream(), 1349 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1350 (int)ObjectAlignmentInBytes, BytesPerLong); 1351 return false; 1352 } 1353 // It does not make sense to have big object alignment 1354 // since a space lost due to alignment will be greater 1355 // then a saved space from compressed oops. 1356 if ((int)ObjectAlignmentInBytes > 256) { 1357 jio_fprintf(defaultStream::error_stream(), 1358 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1359 (int)ObjectAlignmentInBytes); 1360 return false; 1361 } 1362 // In case page size is very small. 1363 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1364 jio_fprintf(defaultStream::error_stream(), 1365 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1366 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1367 return false; 1368 } 1369 return true; 1370 } 1371 1372 inline uintx max_heap_for_compressed_oops() { 1373 // Avoid sign flip. 1374 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1375 return 0; 1376 } 1377 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1378 NOT_LP64(ShouldNotReachHere(); return 0); 1379 } 1380 1381 bool Arguments::should_auto_select_low_pause_collector() { 1382 if (UseAutoGCSelectPolicy && 1383 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1384 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1385 if (PrintGCDetails) { 1386 // Cannot use gclog_or_tty yet. 1387 tty->print_cr("Automatic selection of the low pause collector" 1388 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1389 } 1390 return true; 1391 } 1392 return false; 1393 } 1394 1395 void Arguments::set_use_compressed_oops() { 1396 #ifndef ZERO 1397 #ifdef _LP64 1398 // MaxHeapSize is not set up properly at this point, but 1399 // the only value that can override MaxHeapSize if we are 1400 // to use UseCompressedOops is InitialHeapSize. 1401 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1402 1403 if (max_heap_size <= max_heap_for_compressed_oops()) { 1404 #if !defined(COMPILER1) || defined(TIERED) 1405 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1406 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1407 } 1408 #endif 1409 #ifdef _WIN64 1410 if (UseLargePages && UseCompressedOops) { 1411 // Cannot allocate guard pages for implicit checks in indexed addressing 1412 // mode, when large pages are specified on windows. 1413 // This flag could be switched ON if narrow oop base address is set to 0, 1414 // see code in Universe::initialize_heap(). 1415 Universe::set_narrow_oop_use_implicit_null_checks(false); 1416 } 1417 #endif // _WIN64 1418 } else { 1419 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1420 warning("Max heap size too large for Compressed Oops"); 1421 FLAG_SET_DEFAULT(UseCompressedOops, false); 1422 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1423 } 1424 } 1425 #endif // _LP64 1426 #endif // ZERO 1427 } 1428 1429 void Arguments::set_ergonomics_flags() { 1430 1431 if (os::is_server_class_machine()) { 1432 // If no other collector is requested explicitly, 1433 // let the VM select the collector based on 1434 // machine class and automatic selection policy. 1435 if (!UseSerialGC && 1436 !UseConcMarkSweepGC && 1437 !UseG1GC && 1438 !UseParNewGC && 1439 FLAG_IS_DEFAULT(UseParallelGC)) { 1440 if (should_auto_select_low_pause_collector()) { 1441 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1442 } else { 1443 FLAG_SET_ERGO(bool, UseParallelGC, true); 1444 } 1445 } 1446 // Shared spaces work fine with other GCs but causes bytecode rewriting 1447 // to be disabled, which hurts interpreter performance and decreases 1448 // server performance. On server class machines, keep the default 1449 // off unless it is asked for. Future work: either add bytecode rewriting 1450 // at link time, or rewrite bytecodes in non-shared methods. 1451 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1452 no_shared_spaces(); 1453 } 1454 } 1455 1456 #ifndef ZERO 1457 #ifdef _LP64 1458 set_use_compressed_oops(); 1459 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1460 if (!UseCompressedOops) { 1461 if (UseCompressedKlassPointers) { 1462 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1463 } 1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1465 } else { 1466 // Turn on UseCompressedKlassPointers too 1467 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1468 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1469 } 1470 // Set the ClassMetaspaceSize to something that will not need to be 1471 // expanded, since it cannot be expanded. 1472 if (UseCompressedKlassPointers) { 1473 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1474 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1475 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1476 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1477 // 100,000 classes seems like a good size, so 100M assumes around 1K 1478 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1479 // size per klass. Eventually, this will be parameterized because it 1480 // would also be useful to determine the optimal size of the 1481 // systemDictionary. 1482 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1483 } 1484 } 1485 } 1486 // Also checks that certain machines are slower with compressed oops 1487 // in vm_version initialization code. 1488 #endif // _LP64 1489 #endif // !ZERO 1490 } 1491 1492 void Arguments::set_parallel_gc_flags() { 1493 assert(UseParallelGC || UseParallelOldGC, "Error"); 1494 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1495 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1496 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1497 } 1498 FLAG_SET_DEFAULT(UseParallelGC, true); 1499 1500 // If no heap maximum was requested explicitly, use some reasonable fraction 1501 // of the physical memory, up to a maximum of 1GB. 1502 FLAG_SET_DEFAULT(ParallelGCThreads, 1503 Abstract_VM_Version::parallel_worker_threads()); 1504 if (ParallelGCThreads == 0) { 1505 jio_fprintf(defaultStream::error_stream(), 1506 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1507 vm_exit(1); 1508 } 1509 1510 1511 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1512 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1513 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1514 // See CR 6362902 for details. 1515 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1516 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1517 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1518 } 1519 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1520 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1521 } 1522 } 1523 1524 if (UseParallelOldGC) { 1525 // Par compact uses lower default values since they are treated as 1526 // minimums. These are different defaults because of the different 1527 // interpretation and are not ergonomically set. 1528 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1529 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1530 } 1531 } 1532 } 1533 1534 void Arguments::set_g1_gc_flags() { 1535 assert(UseG1GC, "Error"); 1536 #ifdef COMPILER1 1537 FastTLABRefill = false; 1538 #endif 1539 FLAG_SET_DEFAULT(ParallelGCThreads, 1540 Abstract_VM_Version::parallel_worker_threads()); 1541 if (ParallelGCThreads == 0) { 1542 FLAG_SET_DEFAULT(ParallelGCThreads, 1543 Abstract_VM_Version::parallel_worker_threads()); 1544 } 1545 1546 // MarkStackSize will be set (if it hasn't been set by the user) 1547 // when concurrent marking is initialized. 1548 // Its value will be based upon the number of parallel marking threads. 1549 // But we do set the maximum mark stack size here. 1550 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1551 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1552 } 1553 1554 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1555 // In G1, we want the default GC overhead goal to be higher than 1556 // say in PS. So we set it here to 10%. Otherwise the heap might 1557 // be expanded more aggressively than we would like it to. In 1558 // fact, even 10% seems to not be high enough in some cases 1559 // (especially small GC stress tests that the main thing they do 1560 // is allocation). We might consider increase it further. 1561 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1562 } 1563 1564 if (PrintGCDetails && Verbose) { 1565 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1566 MarkStackSize / K, MarkStackSizeMax / K); 1567 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1568 } 1569 } 1570 1571 julong Arguments::limit_by_allocatable_memory(julong limit) { 1572 julong max_allocatable; 1573 julong result = limit; 1574 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1575 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1576 } 1577 return result; 1578 } 1579 1580 void Arguments::set_heap_base_min_address() { 1581 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) { 1582 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86. 1583 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1 1584 // some extra space for the C-heap compared to other collectors. 1585 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that 1586 // code that checks for default values work correctly. 1587 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G); 1588 } 1589 } 1590 1591 void Arguments::set_heap_size() { 1592 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1593 // Deprecated flag 1594 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1595 } 1596 1597 const julong phys_mem = 1598 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1599 : (julong)MaxRAM; 1600 1601 // If the maximum heap size has not been set with -Xmx, 1602 // then set it as fraction of the size of physical memory, 1603 // respecting the maximum and minimum sizes of the heap. 1604 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1605 julong reasonable_max = phys_mem / MaxRAMFraction; 1606 1607 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1608 // Small physical memory, so use a minimum fraction of it for the heap 1609 reasonable_max = phys_mem / MinRAMFraction; 1610 } else { 1611 // Not-small physical memory, so require a heap at least 1612 // as large as MaxHeapSize 1613 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1614 } 1615 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1616 // Limit the heap size to ErgoHeapSizeLimit 1617 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1618 } 1619 if (UseCompressedOops) { 1620 // Limit the heap size to the maximum possible when using compressed oops 1621 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1622 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1623 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1624 // but it should be not less than default MaxHeapSize. 1625 max_coop_heap -= HeapBaseMinAddress; 1626 } 1627 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1628 } 1629 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1630 1631 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1632 // An initial heap size was specified on the command line, 1633 // so be sure that the maximum size is consistent. Done 1634 // after call to limit_by_allocatable_memory because that 1635 // method might reduce the allocation size. 1636 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1637 } 1638 1639 if (PrintGCDetails && Verbose) { 1640 // Cannot use gclog_or_tty yet. 1641 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1642 } 1643 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1644 } 1645 1646 // If the minimum or initial heap_size have not been set or requested to be set 1647 // ergonomically, set them accordingly. 1648 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1649 julong reasonable_minimum = (julong)(OldSize + NewSize); 1650 1651 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1652 1653 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1654 1655 if (InitialHeapSize == 0) { 1656 julong reasonable_initial = phys_mem / InitialRAMFraction; 1657 1658 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1659 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1660 1661 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1662 1663 if (PrintGCDetails && Verbose) { 1664 // Cannot use gclog_or_tty yet. 1665 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1666 } 1667 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1668 } 1669 // If the minimum heap size has not been set (via -Xms), 1670 // synchronize with InitialHeapSize to avoid errors with the default value. 1671 if (min_heap_size() == 0) { 1672 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1673 if (PrintGCDetails && Verbose) { 1674 // Cannot use gclog_or_tty yet. 1675 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1676 } 1677 } 1678 } 1679 } 1680 1681 // This must be called after ergonomics because we want bytecode rewriting 1682 // if the server compiler is used, or if UseSharedSpaces is disabled. 1683 void Arguments::set_bytecode_flags() { 1684 // Better not attempt to store into a read-only space. 1685 if (UseSharedSpaces) { 1686 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1687 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1688 } 1689 1690 if (!RewriteBytecodes) { 1691 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1692 } 1693 } 1694 1695 // Aggressive optimization flags -XX:+AggressiveOpts 1696 void Arguments::set_aggressive_opts_flags() { 1697 #ifdef COMPILER2 1698 if (AggressiveUnboxing) { 1699 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1700 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1701 } else if (!EliminateAutoBox) { 1702 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1703 AggressiveUnboxing = false; 1704 } 1705 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1706 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1707 } else if (!DoEscapeAnalysis) { 1708 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1709 AggressiveUnboxing = false; 1710 } 1711 } 1712 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1713 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1714 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1715 } 1716 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1717 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1718 } 1719 1720 // Feed the cache size setting into the JDK 1721 char buffer[1024]; 1722 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1723 add_property(buffer); 1724 } 1725 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1726 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1727 } 1728 #endif 1729 1730 if (AggressiveOpts) { 1731 // Sample flag setting code 1732 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1733 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1734 // } 1735 } 1736 } 1737 1738 //=========================================================================================================== 1739 // Parsing of java.compiler property 1740 1741 void Arguments::process_java_compiler_argument(char* arg) { 1742 // For backwards compatibility, Djava.compiler=NONE or "" 1743 // causes us to switch to -Xint mode UNLESS -Xdebug 1744 // is also specified. 1745 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1746 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1747 } 1748 } 1749 1750 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1751 _sun_java_launcher = strdup(launcher); 1752 if (strcmp("gamma", _sun_java_launcher) == 0) { 1753 _created_by_gamma_launcher = true; 1754 } 1755 } 1756 1757 bool Arguments::created_by_java_launcher() { 1758 assert(_sun_java_launcher != NULL, "property must have value"); 1759 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1760 } 1761 1762 bool Arguments::created_by_gamma_launcher() { 1763 return _created_by_gamma_launcher; 1764 } 1765 1766 //=========================================================================================================== 1767 // Parsing of main arguments 1768 1769 bool Arguments::verify_interval(uintx val, uintx min, 1770 uintx max, const char* name) { 1771 // Returns true iff value is in the inclusive interval [min..max] 1772 // false, otherwise. 1773 if (val >= min && val <= max) { 1774 return true; 1775 } 1776 jio_fprintf(defaultStream::error_stream(), 1777 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1778 " and " UINTX_FORMAT "\n", 1779 name, val, min, max); 1780 return false; 1781 } 1782 1783 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1784 // Returns true if given value is at least specified min threshold 1785 // false, otherwise. 1786 if (val >= min ) { 1787 return true; 1788 } 1789 jio_fprintf(defaultStream::error_stream(), 1790 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1791 name, val, min); 1792 return false; 1793 } 1794 1795 bool Arguments::verify_percentage(uintx value, const char* name) { 1796 if (value <= 100) { 1797 return true; 1798 } 1799 jio_fprintf(defaultStream::error_stream(), 1800 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1801 name, value); 1802 return false; 1803 } 1804 1805 #if !INCLUDE_ALL_GCS 1806 #ifdef ASSERT 1807 static bool verify_serial_gc_flags() { 1808 return (UseSerialGC && 1809 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1810 UseParallelGC || UseParallelOldGC)); 1811 } 1812 #endif // ASSERT 1813 #endif // INCLUDE_ALL_GCS 1814 1815 // check if do gclog rotation 1816 // +UseGCLogFileRotation is a must, 1817 // no gc log rotation when log file not supplied or 1818 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1819 void check_gclog_consistency() { 1820 if (UseGCLogFileRotation) { 1821 if ((Arguments::gc_log_filename() == NULL) || 1822 (NumberOfGCLogFiles == 0) || 1823 (GCLogFileSize == 0)) { 1824 jio_fprintf(defaultStream::output_stream(), 1825 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1826 "where num_of_file > 0 and num_of_size > 0\n" 1827 "GC log rotation is turned off\n"); 1828 UseGCLogFileRotation = false; 1829 } 1830 } 1831 1832 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1833 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1834 jio_fprintf(defaultStream::output_stream(), 1835 "GCLogFileSize changed to minimum 8K\n"); 1836 } 1837 } 1838 1839 // Check consistency of GC selection 1840 bool Arguments::check_gc_consistency() { 1841 check_gclog_consistency(); 1842 bool status = true; 1843 // Ensure that the user has not selected conflicting sets 1844 // of collectors. [Note: this check is merely a user convenience; 1845 // collectors over-ride each other so that only a non-conflicting 1846 // set is selected; however what the user gets is not what they 1847 // may have expected from the combination they asked for. It's 1848 // better to reduce user confusion by not allowing them to 1849 // select conflicting combinations. 1850 uint i = 0; 1851 if (UseSerialGC) i++; 1852 if (UseConcMarkSweepGC || UseParNewGC) i++; 1853 if (UseParallelGC || UseParallelOldGC) i++; 1854 if (UseG1GC) i++; 1855 if (i > 1) { 1856 jio_fprintf(defaultStream::error_stream(), 1857 "Conflicting collector combinations in option list; " 1858 "please refer to the release notes for the combinations " 1859 "allowed\n"); 1860 status = false; 1861 } else if (ReservedCodeCacheSize > 2*G) { 1862 // Code cache size larger than MAXINT is not supported. 1863 jio_fprintf(defaultStream::error_stream(), 1864 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1865 (2*G)/M); 1866 status = false; 1867 } 1868 return status; 1869 } 1870 1871 void Arguments::check_deprecated_gcs() { 1872 if (UseConcMarkSweepGC && !UseParNewGC) { 1873 warning("Using the DefNew young collector with the CMS collector is deprecated " 1874 "and will likely be removed in a future release"); 1875 } 1876 1877 if (UseParNewGC && !UseConcMarkSweepGC) { 1878 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1879 // set up UseSerialGC properly, so that can't be used in the check here. 1880 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1881 "and will likely be removed in a future release"); 1882 } 1883 1884 if (CMSIncrementalMode) { 1885 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1886 } 1887 } 1888 1889 void Arguments::check_deprecated_gc_flags() { 1890 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1891 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1892 "and will likely be removed in future release"); 1893 } 1894 } 1895 1896 // Check stack pages settings 1897 bool Arguments::check_stack_pages() 1898 { 1899 bool status = true; 1900 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1901 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1902 // greater stack shadow pages can't generate instruction to bang stack 1903 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1904 return status; 1905 } 1906 1907 // Check the consistency of vm_init_args 1908 bool Arguments::check_vm_args_consistency() { 1909 // Method for adding checks for flag consistency. 1910 // The intent is to warn the user of all possible conflicts, 1911 // before returning an error. 1912 // Note: Needs platform-dependent factoring. 1913 bool status = true; 1914 1915 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1916 // builds so the cost of stack banging can be measured. 1917 #if (defined(PRODUCT) && defined(SOLARIS)) 1918 if (!UseBoundThreads && !UseStackBanging) { 1919 jio_fprintf(defaultStream::error_stream(), 1920 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1921 1922 status = false; 1923 } 1924 #endif 1925 1926 if (TLABRefillWasteFraction == 0) { 1927 jio_fprintf(defaultStream::error_stream(), 1928 "TLABRefillWasteFraction should be a denominator, " 1929 "not " SIZE_FORMAT "\n", 1930 TLABRefillWasteFraction); 1931 status = false; 1932 } 1933 1934 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1935 "AdaptiveSizePolicyWeight"); 1936 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1937 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1938 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1939 1940 // Divide by bucket size to prevent a large size from causing rollover when 1941 // calculating amount of memory needed to be allocated for the String table. 1942 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1943 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1944 1945 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1946 jio_fprintf(defaultStream::error_stream(), 1947 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1948 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1949 MinHeapFreeRatio, MaxHeapFreeRatio); 1950 status = false; 1951 } 1952 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1953 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1954 1955 // Min/MaxMetaspaceFreeRatio 1956 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1957 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1958 1959 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1960 jio_fprintf(defaultStream::error_stream(), 1961 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1962 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1963 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1964 MinMetaspaceFreeRatio, 1965 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1966 MaxMetaspaceFreeRatio); 1967 status = false; 1968 } 1969 1970 // Trying to keep 100% free is not practical 1971 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1972 1973 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1974 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1975 } 1976 1977 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1978 // Settings to encourage splitting. 1979 if (!FLAG_IS_CMDLINE(NewRatio)) { 1980 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 1981 } 1982 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1983 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1984 } 1985 } 1986 1987 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1988 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1989 if (GCTimeLimit == 100) { 1990 // Turn off gc-overhead-limit-exceeded checks 1991 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1992 } 1993 1994 status = status && check_gc_consistency(); 1995 status = status && check_stack_pages(); 1996 1997 if (CMSIncrementalMode) { 1998 if (!UseConcMarkSweepGC) { 1999 jio_fprintf(defaultStream::error_stream(), 2000 "error: invalid argument combination.\n" 2001 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2002 "selected in order\nto use CMSIncrementalMode.\n"); 2003 status = false; 2004 } else { 2005 status = status && verify_percentage(CMSIncrementalDutyCycle, 2006 "CMSIncrementalDutyCycle"); 2007 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2008 "CMSIncrementalDutyCycleMin"); 2009 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2010 "CMSIncrementalSafetyFactor"); 2011 status = status && verify_percentage(CMSIncrementalOffset, 2012 "CMSIncrementalOffset"); 2013 status = status && verify_percentage(CMSExpAvgFactor, 2014 "CMSExpAvgFactor"); 2015 // If it was not set on the command line, set 2016 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2017 if (CMSInitiatingOccupancyFraction < 0) { 2018 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2019 } 2020 } 2021 } 2022 2023 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2024 // insists that we hold the requisite locks so that the iteration is 2025 // MT-safe. For the verification at start-up and shut-down, we don't 2026 // yet have a good way of acquiring and releasing these locks, 2027 // which are not visible at the CollectedHeap level. We want to 2028 // be able to acquire these locks and then do the iteration rather 2029 // than just disable the lock verification. This will be fixed under 2030 // bug 4788986. 2031 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2032 if (VerifyDuringStartup) { 2033 warning("Heap verification at start-up disabled " 2034 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2035 VerifyDuringStartup = false; // Disable verification at start-up 2036 } 2037 2038 if (VerifyBeforeExit) { 2039 warning("Heap verification at shutdown disabled " 2040 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2041 VerifyBeforeExit = false; // Disable verification at shutdown 2042 } 2043 } 2044 2045 // Note: only executed in non-PRODUCT mode 2046 if (!UseAsyncConcMarkSweepGC && 2047 (ExplicitGCInvokesConcurrent || 2048 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2049 jio_fprintf(defaultStream::error_stream(), 2050 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2051 " with -UseAsyncConcMarkSweepGC"); 2052 status = false; 2053 } 2054 2055 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2056 2057 #if INCLUDE_ALL_GCS 2058 if (UseG1GC) { 2059 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2060 "InitiatingHeapOccupancyPercent"); 2061 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2062 "G1RefProcDrainInterval"); 2063 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2064 "G1ConcMarkStepDurationMillis"); 2065 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2066 "G1ConcRSHotCardLimit"); 2067 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2068 "G1ConcRSLogCacheSize"); 2069 } 2070 if (UseConcMarkSweepGC) { 2071 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2072 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2073 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2074 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2075 2076 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2077 2078 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2079 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2080 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2081 2082 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2083 2084 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2085 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2086 2087 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2088 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2089 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2090 2091 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2092 2093 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2094 2095 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2096 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2097 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2098 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2099 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2100 } 2101 2102 if (UseParallelGC || UseParallelOldGC) { 2103 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2104 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2105 2106 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2107 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2108 2109 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2110 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2111 2112 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2113 2114 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2115 } 2116 #endif // INCLUDE_ALL_GCS 2117 2118 status = status && verify_interval(RefDiscoveryPolicy, 2119 ReferenceProcessor::DiscoveryPolicyMin, 2120 ReferenceProcessor::DiscoveryPolicyMax, 2121 "RefDiscoveryPolicy"); 2122 2123 // Limit the lower bound of this flag to 1 as it is used in a division 2124 // expression. 2125 status = status && verify_interval(TLABWasteTargetPercent, 2126 1, 100, "TLABWasteTargetPercent"); 2127 2128 status = status && verify_object_alignment(); 2129 2130 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2131 "ClassMetaspaceSize"); 2132 2133 status = status && verify_interval(MarkStackSizeMax, 2134 1, (max_jint - 1), "MarkStackSizeMax"); 2135 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2136 2137 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2138 2139 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2140 2141 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2142 2143 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2144 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2145 2146 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2147 2148 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2149 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2150 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2151 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2152 2153 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2154 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2155 2156 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2157 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2158 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2159 2160 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2161 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2162 2163 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2164 // just for that, so hardcode here. 2165 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2166 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2167 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2168 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2169 2170 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2171 #ifdef SPARC 2172 if (UseConcMarkSweepGC || UseG1GC) { 2173 // Issue a stern warning if the user has explicitly set 2174 // UseMemSetInBOT (it is known to cause issues), but allow 2175 // use for experimentation and debugging. 2176 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2177 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2178 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2179 " on sun4v; please understand that you are using at your own risk!"); 2180 } 2181 } 2182 #endif // SPARC 2183 2184 if (PrintNMTStatistics) { 2185 #if INCLUDE_NMT 2186 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2187 #endif // INCLUDE_NMT 2188 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2189 PrintNMTStatistics = false; 2190 #if INCLUDE_NMT 2191 } 2192 #endif 2193 } 2194 2195 // Need to limit the extent of the padding to reasonable size. 2196 // 8K is well beyond the reasonable HW cache line size, even with the 2197 // aggressive prefetching, while still leaving the room for segregating 2198 // among the distinct pages. 2199 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2200 jio_fprintf(defaultStream::error_stream(), 2201 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n", 2202 ContendedPaddingWidth, 0, 8192); 2203 status = false; 2204 } 2205 2206 // Need to enforce the padding not to break the existing field alignments. 2207 // It is sufficient to check against the largest type size. 2208 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2209 jio_fprintf(defaultStream::error_stream(), 2210 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n", 2211 ContendedPaddingWidth, BytesPerLong); 2212 status = false; 2213 } 2214 2215 // Check lower bounds of the code cache 2216 // Template Interpreter code is approximately 3X larger in debug builds. 2217 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2218 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2219 jio_fprintf(defaultStream::error_stream(), 2220 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2221 os::vm_page_size()/K); 2222 status = false; 2223 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2224 jio_fprintf(defaultStream::error_stream(), 2225 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2226 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2227 status = false; 2228 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2229 jio_fprintf(defaultStream::error_stream(), 2230 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2231 min_code_cache_size/K); 2232 status = false; 2233 } else if (ReservedCodeCacheSize > 2*G) { 2234 // Code cache size larger than MAXINT is not supported. 2235 jio_fprintf(defaultStream::error_stream(), 2236 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2237 (2*G)/M); 2238 status = false; 2239 } 2240 return status; 2241 } 2242 2243 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2244 const char* option_type) { 2245 if (ignore) return false; 2246 2247 const char* spacer = " "; 2248 if (option_type == NULL) { 2249 option_type = ++spacer; // Set both to the empty string. 2250 } 2251 2252 if (os::obsolete_option(option)) { 2253 jio_fprintf(defaultStream::error_stream(), 2254 "Obsolete %s%soption: %s\n", option_type, spacer, 2255 option->optionString); 2256 return false; 2257 } else { 2258 jio_fprintf(defaultStream::error_stream(), 2259 "Unrecognized %s%soption: %s\n", option_type, spacer, 2260 option->optionString); 2261 return true; 2262 } 2263 } 2264 2265 static const char* user_assertion_options[] = { 2266 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2267 }; 2268 2269 static const char* system_assertion_options[] = { 2270 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2271 }; 2272 2273 // Return true if any of the strings in null-terminated array 'names' matches. 2274 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2275 // the option must match exactly. 2276 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2277 bool tail_allowed) { 2278 for (/* empty */; *names != NULL; ++names) { 2279 if (match_option(option, *names, tail)) { 2280 if (**tail == '\0' || tail_allowed && **tail == ':') { 2281 return true; 2282 } 2283 } 2284 } 2285 return false; 2286 } 2287 2288 bool Arguments::parse_uintx(const char* value, 2289 uintx* uintx_arg, 2290 uintx min_size) { 2291 2292 // Check the sign first since atomull() parses only unsigned values. 2293 bool value_is_positive = !(*value == '-'); 2294 2295 if (value_is_positive) { 2296 julong n; 2297 bool good_return = atomull(value, &n); 2298 if (good_return) { 2299 bool above_minimum = n >= min_size; 2300 bool value_is_too_large = n > max_uintx; 2301 2302 if (above_minimum && !value_is_too_large) { 2303 *uintx_arg = n; 2304 return true; 2305 } 2306 } 2307 } 2308 return false; 2309 } 2310 2311 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2312 julong* long_arg, 2313 julong min_size) { 2314 if (!atomull(s, long_arg)) return arg_unreadable; 2315 return check_memory_size(*long_arg, min_size); 2316 } 2317 2318 // Parse JavaVMInitArgs structure 2319 2320 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2321 // For components of the system classpath. 2322 SysClassPath scp(Arguments::get_sysclasspath()); 2323 bool scp_assembly_required = false; 2324 2325 // Save default settings for some mode flags 2326 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2327 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2328 Arguments::_ClipInlining = ClipInlining; 2329 Arguments::_BackgroundCompilation = BackgroundCompilation; 2330 2331 // Setup flags for mixed which is the default 2332 set_mode_flags(_mixed); 2333 2334 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2335 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2336 if (result != JNI_OK) { 2337 return result; 2338 } 2339 2340 // Parse JavaVMInitArgs structure passed in 2341 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2342 if (result != JNI_OK) { 2343 return result; 2344 } 2345 2346 if (AggressiveOpts) { 2347 // Insert alt-rt.jar between user-specified bootclasspath 2348 // prefix and the default bootclasspath. os::set_boot_path() 2349 // uses meta_index_dir as the default bootclasspath directory. 2350 const char* altclasses_jar = "alt-rt.jar"; 2351 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2352 strlen(altclasses_jar); 2353 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2354 strcpy(altclasses_path, get_meta_index_dir()); 2355 strcat(altclasses_path, altclasses_jar); 2356 scp.add_suffix_to_prefix(altclasses_path); 2357 scp_assembly_required = true; 2358 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2359 } 2360 2361 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2362 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2363 if (result != JNI_OK) { 2364 return result; 2365 } 2366 2367 // Do final processing now that all arguments have been parsed 2368 result = finalize_vm_init_args(&scp, scp_assembly_required); 2369 if (result != JNI_OK) { 2370 return result; 2371 } 2372 2373 return JNI_OK; 2374 } 2375 2376 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2377 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2378 // are dealing with -agentpath (case where name is a path), otherwise with 2379 // -agentlib 2380 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2381 char *_name; 2382 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2383 size_t _len_hprof, _len_jdwp, _len_prefix; 2384 2385 if (is_path) { 2386 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2387 return false; 2388 } 2389 2390 _name++; // skip past last path separator 2391 _len_prefix = strlen(JNI_LIB_PREFIX); 2392 2393 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2394 return false; 2395 } 2396 2397 _name += _len_prefix; 2398 _len_hprof = strlen(_hprof); 2399 _len_jdwp = strlen(_jdwp); 2400 2401 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2402 _name += _len_hprof; 2403 } 2404 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2405 _name += _len_jdwp; 2406 } 2407 else { 2408 return false; 2409 } 2410 2411 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2412 return false; 2413 } 2414 2415 return true; 2416 } 2417 2418 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2419 return true; 2420 } 2421 2422 return false; 2423 } 2424 2425 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2426 SysClassPath* scp_p, 2427 bool* scp_assembly_required_p, 2428 FlagValueOrigin origin) { 2429 // Remaining part of option string 2430 const char* tail; 2431 2432 // iterate over arguments 2433 for (int index = 0; index < args->nOptions; index++) { 2434 bool is_absolute_path = false; // for -agentpath vs -agentlib 2435 2436 const JavaVMOption* option = args->options + index; 2437 2438 if (!match_option(option, "-Djava.class.path", &tail) && 2439 !match_option(option, "-Dsun.java.command", &tail) && 2440 !match_option(option, "-Dsun.java.launcher", &tail)) { 2441 2442 // add all jvm options to the jvm_args string. This string 2443 // is used later to set the java.vm.args PerfData string constant. 2444 // the -Djava.class.path and the -Dsun.java.command options are 2445 // omitted from jvm_args string as each have their own PerfData 2446 // string constant object. 2447 build_jvm_args(option->optionString); 2448 } 2449 2450 // -verbose:[class/gc/jni] 2451 if (match_option(option, "-verbose", &tail)) { 2452 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2453 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2454 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2455 } else if (!strcmp(tail, ":gc")) { 2456 FLAG_SET_CMDLINE(bool, PrintGC, true); 2457 } else if (!strcmp(tail, ":jni")) { 2458 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2459 } 2460 // -da / -ea / -disableassertions / -enableassertions 2461 // These accept an optional class/package name separated by a colon, e.g., 2462 // -da:java.lang.Thread. 2463 } else if (match_option(option, user_assertion_options, &tail, true)) { 2464 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2465 if (*tail == '\0') { 2466 JavaAssertions::setUserClassDefault(enable); 2467 } else { 2468 assert(*tail == ':', "bogus match by match_option()"); 2469 JavaAssertions::addOption(tail + 1, enable); 2470 } 2471 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2472 } else if (match_option(option, system_assertion_options, &tail, false)) { 2473 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2474 JavaAssertions::setSystemClassDefault(enable); 2475 // -bootclasspath: 2476 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2477 scp_p->reset_path(tail); 2478 *scp_assembly_required_p = true; 2479 // -bootclasspath/a: 2480 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2481 scp_p->add_suffix(tail); 2482 *scp_assembly_required_p = true; 2483 // -bootclasspath/p: 2484 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2485 scp_p->add_prefix(tail); 2486 *scp_assembly_required_p = true; 2487 // -Xrun 2488 } else if (match_option(option, "-Xrun", &tail)) { 2489 if (tail != NULL) { 2490 const char* pos = strchr(tail, ':'); 2491 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2492 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2493 name[len] = '\0'; 2494 2495 char *options = NULL; 2496 if(pos != NULL) { 2497 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2498 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2499 } 2500 #if !INCLUDE_JVMTI 2501 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2502 jio_fprintf(defaultStream::error_stream(), 2503 "Profiling and debugging agents are not supported in this VM\n"); 2504 return JNI_ERR; 2505 } 2506 #endif // !INCLUDE_JVMTI 2507 add_init_library(name, options); 2508 } 2509 // -agentlib and -agentpath 2510 } else if (match_option(option, "-agentlib:", &tail) || 2511 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2512 if(tail != NULL) { 2513 const char* pos = strchr(tail, '='); 2514 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2515 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2516 name[len] = '\0'; 2517 2518 char *options = NULL; 2519 if(pos != NULL) { 2520 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2521 } 2522 #if !INCLUDE_JVMTI 2523 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2524 jio_fprintf(defaultStream::error_stream(), 2525 "Profiling and debugging agents are not supported in this VM\n"); 2526 return JNI_ERR; 2527 } 2528 #endif // !INCLUDE_JVMTI 2529 add_init_agent(name, options, is_absolute_path); 2530 } 2531 // -javaagent 2532 } else if (match_option(option, "-javaagent:", &tail)) { 2533 #if !INCLUDE_JVMTI 2534 jio_fprintf(defaultStream::error_stream(), 2535 "Instrumentation agents are not supported in this VM\n"); 2536 return JNI_ERR; 2537 #else 2538 if(tail != NULL) { 2539 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2540 add_init_agent("instrument", options, false); 2541 } 2542 #endif // !INCLUDE_JVMTI 2543 // -Xnoclassgc 2544 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2545 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2546 // -Xincgc: i-CMS 2547 } else if (match_option(option, "-Xincgc", &tail)) { 2548 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2549 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2550 // -Xnoincgc: no i-CMS 2551 } else if (match_option(option, "-Xnoincgc", &tail)) { 2552 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2553 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2554 // -Xconcgc 2555 } else if (match_option(option, "-Xconcgc", &tail)) { 2556 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2557 // -Xnoconcgc 2558 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2559 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2560 // -Xbatch 2561 } else if (match_option(option, "-Xbatch", &tail)) { 2562 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2563 // -Xmn for compatibility with other JVM vendors 2564 } else if (match_option(option, "-Xmn", &tail)) { 2565 julong long_initial_eden_size = 0; 2566 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2567 if (errcode != arg_in_range) { 2568 jio_fprintf(defaultStream::error_stream(), 2569 "Invalid initial eden size: %s\n", option->optionString); 2570 describe_range_error(errcode); 2571 return JNI_EINVAL; 2572 } 2573 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2574 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2575 // -Xms 2576 } else if (match_option(option, "-Xms", &tail)) { 2577 julong long_initial_heap_size = 0; 2578 // an initial heap size of 0 means automatically determine 2579 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2580 if (errcode != arg_in_range) { 2581 jio_fprintf(defaultStream::error_stream(), 2582 "Invalid initial heap size: %s\n", option->optionString); 2583 describe_range_error(errcode); 2584 return JNI_EINVAL; 2585 } 2586 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2587 // Currently the minimum size and the initial heap sizes are the same. 2588 set_min_heap_size(InitialHeapSize); 2589 // -Xmx 2590 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2591 julong long_max_heap_size = 0; 2592 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2593 if (errcode != arg_in_range) { 2594 jio_fprintf(defaultStream::error_stream(), 2595 "Invalid maximum heap size: %s\n", option->optionString); 2596 describe_range_error(errcode); 2597 return JNI_EINVAL; 2598 } 2599 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2600 // Xmaxf 2601 } else if (match_option(option, "-Xmaxf", &tail)) { 2602 int maxf = (int)(atof(tail) * 100); 2603 if (maxf < 0 || maxf > 100) { 2604 jio_fprintf(defaultStream::error_stream(), 2605 "Bad max heap free percentage size: %s\n", 2606 option->optionString); 2607 return JNI_EINVAL; 2608 } else { 2609 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2610 } 2611 // Xminf 2612 } else if (match_option(option, "-Xminf", &tail)) { 2613 int minf = (int)(atof(tail) * 100); 2614 if (minf < 0 || minf > 100) { 2615 jio_fprintf(defaultStream::error_stream(), 2616 "Bad min heap free percentage size: %s\n", 2617 option->optionString); 2618 return JNI_EINVAL; 2619 } else { 2620 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2621 } 2622 // -Xss 2623 } else if (match_option(option, "-Xss", &tail)) { 2624 julong long_ThreadStackSize = 0; 2625 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2626 if (errcode != arg_in_range) { 2627 jio_fprintf(defaultStream::error_stream(), 2628 "Invalid thread stack size: %s\n", option->optionString); 2629 describe_range_error(errcode); 2630 return JNI_EINVAL; 2631 } 2632 // Internally track ThreadStackSize in units of 1024 bytes. 2633 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2634 round_to((int)long_ThreadStackSize, K) / K); 2635 // -Xoss 2636 } else if (match_option(option, "-Xoss", &tail)) { 2637 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2638 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2639 julong long_CodeCacheExpansionSize = 0; 2640 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2641 if (errcode != arg_in_range) { 2642 jio_fprintf(defaultStream::error_stream(), 2643 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2644 os::vm_page_size()/K); 2645 return JNI_EINVAL; 2646 } 2647 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2648 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2649 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2650 julong long_ReservedCodeCacheSize = 0; 2651 2652 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2653 if (errcode != arg_in_range) { 2654 jio_fprintf(defaultStream::error_stream(), 2655 "Invalid maximum code cache size: %s.\n", option->optionString); 2656 return JNI_EINVAL; 2657 } 2658 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2659 //-XX:IncreaseFirstTierCompileThresholdAt= 2660 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2661 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2662 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2663 jio_fprintf(defaultStream::error_stream(), 2664 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2665 option->optionString); 2666 return JNI_EINVAL; 2667 } 2668 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2669 // -green 2670 } else if (match_option(option, "-green", &tail)) { 2671 jio_fprintf(defaultStream::error_stream(), 2672 "Green threads support not available\n"); 2673 return JNI_EINVAL; 2674 // -native 2675 } else if (match_option(option, "-native", &tail)) { 2676 // HotSpot always uses native threads, ignore silently for compatibility 2677 // -Xsqnopause 2678 } else if (match_option(option, "-Xsqnopause", &tail)) { 2679 // EVM option, ignore silently for compatibility 2680 // -Xrs 2681 } else if (match_option(option, "-Xrs", &tail)) { 2682 // Classic/EVM option, new functionality 2683 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2684 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2685 // change default internal VM signals used - lower case for back compat 2686 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2687 // -Xoptimize 2688 } else if (match_option(option, "-Xoptimize", &tail)) { 2689 // EVM option, ignore silently for compatibility 2690 // -Xprof 2691 } else if (match_option(option, "-Xprof", &tail)) { 2692 #if INCLUDE_FPROF 2693 _has_profile = true; 2694 #else // INCLUDE_FPROF 2695 jio_fprintf(defaultStream::error_stream(), 2696 "Flat profiling is not supported in this VM.\n"); 2697 return JNI_ERR; 2698 #endif // INCLUDE_FPROF 2699 // -Xconcurrentio 2700 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2701 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2702 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2703 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2704 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2705 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2706 2707 // -Xinternalversion 2708 } else if (match_option(option, "-Xinternalversion", &tail)) { 2709 jio_fprintf(defaultStream::output_stream(), "%s\n", 2710 VM_Version::internal_vm_info_string()); 2711 vm_exit(0); 2712 #ifndef PRODUCT 2713 // -Xprintflags 2714 } else if (match_option(option, "-Xprintflags", &tail)) { 2715 CommandLineFlags::printFlags(tty, false); 2716 vm_exit(0); 2717 #endif 2718 // -D 2719 } else if (match_option(option, "-D", &tail)) { 2720 if (!add_property(tail)) { 2721 return JNI_ENOMEM; 2722 } 2723 // Out of the box management support 2724 if (match_option(option, "-Dcom.sun.management", &tail)) { 2725 #if INCLUDE_MANAGEMENT 2726 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2727 #else 2728 jio_fprintf(defaultStream::output_stream(), 2729 "-Dcom.sun.management is not supported in this VM.\n"); 2730 return JNI_ERR; 2731 #endif 2732 } 2733 // -Xint 2734 } else if (match_option(option, "-Xint", &tail)) { 2735 set_mode_flags(_int); 2736 // -Xmixed 2737 } else if (match_option(option, "-Xmixed", &tail)) { 2738 set_mode_flags(_mixed); 2739 // -Xcomp 2740 } else if (match_option(option, "-Xcomp", &tail)) { 2741 // for testing the compiler; turn off all flags that inhibit compilation 2742 set_mode_flags(_comp); 2743 // -Xshare:dump 2744 } else if (match_option(option, "-Xshare:dump", &tail)) { 2745 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2746 set_mode_flags(_int); // Prevent compilation, which creates objects 2747 // -Xshare:on 2748 } else if (match_option(option, "-Xshare:on", &tail)) { 2749 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2750 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2751 // -Xshare:auto 2752 } else if (match_option(option, "-Xshare:auto", &tail)) { 2753 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2754 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2755 // -Xshare:off 2756 } else if (match_option(option, "-Xshare:off", &tail)) { 2757 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2758 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2759 // -Xverify 2760 } else if (match_option(option, "-Xverify", &tail)) { 2761 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2762 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2763 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2764 } else if (strcmp(tail, ":remote") == 0) { 2765 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2766 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2767 } else if (strcmp(tail, ":none") == 0) { 2768 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2769 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2770 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2771 return JNI_EINVAL; 2772 } 2773 // -Xdebug 2774 } else if (match_option(option, "-Xdebug", &tail)) { 2775 // note this flag has been used, then ignore 2776 set_xdebug_mode(true); 2777 // -Xnoagent 2778 } else if (match_option(option, "-Xnoagent", &tail)) { 2779 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2780 } else if (match_option(option, "-Xboundthreads", &tail)) { 2781 // Bind user level threads to kernel threads (Solaris only) 2782 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2783 } else if (match_option(option, "-Xloggc:", &tail)) { 2784 // Redirect GC output to the file. -Xloggc:<filename> 2785 // ostream_init_log(), when called will use this filename 2786 // to initialize a fileStream. 2787 _gc_log_filename = strdup(tail); 2788 FLAG_SET_CMDLINE(bool, PrintGC, true); 2789 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2790 2791 // JNI hooks 2792 } else if (match_option(option, "-Xcheck", &tail)) { 2793 if (!strcmp(tail, ":jni")) { 2794 #if !INCLUDE_JNI_CHECK 2795 warning("JNI CHECKING is not supported in this VM"); 2796 #else 2797 CheckJNICalls = true; 2798 #endif // INCLUDE_JNI_CHECK 2799 } else if (is_bad_option(option, args->ignoreUnrecognized, 2800 "check")) { 2801 return JNI_EINVAL; 2802 } 2803 } else if (match_option(option, "vfprintf", &tail)) { 2804 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2805 } else if (match_option(option, "exit", &tail)) { 2806 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2807 } else if (match_option(option, "abort", &tail)) { 2808 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2809 // -XX:+AggressiveHeap 2810 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2811 2812 // This option inspects the machine and attempts to set various 2813 // parameters to be optimal for long-running, memory allocation 2814 // intensive jobs. It is intended for machines with large 2815 // amounts of cpu and memory. 2816 2817 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2818 // VM, but we may not be able to represent the total physical memory 2819 // available (like having 8gb of memory on a box but using a 32bit VM). 2820 // Thus, we need to make sure we're using a julong for intermediate 2821 // calculations. 2822 julong initHeapSize; 2823 julong total_memory = os::physical_memory(); 2824 2825 if (total_memory < (julong)256*M) { 2826 jio_fprintf(defaultStream::error_stream(), 2827 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2828 vm_exit(1); 2829 } 2830 2831 // The heap size is half of available memory, or (at most) 2832 // all of possible memory less 160mb (leaving room for the OS 2833 // when using ISM). This is the maximum; because adaptive sizing 2834 // is turned on below, the actual space used may be smaller. 2835 2836 initHeapSize = MIN2(total_memory / (julong)2, 2837 total_memory - (julong)160*M); 2838 2839 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2840 2841 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2842 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2843 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2844 // Currently the minimum size and the initial heap sizes are the same. 2845 set_min_heap_size(initHeapSize); 2846 } 2847 if (FLAG_IS_DEFAULT(NewSize)) { 2848 // Make the young generation 3/8ths of the total heap. 2849 FLAG_SET_CMDLINE(uintx, NewSize, 2850 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2851 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2852 } 2853 2854 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2855 FLAG_SET_DEFAULT(UseLargePages, true); 2856 #endif 2857 2858 // Increase some data structure sizes for efficiency 2859 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2860 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2861 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2862 2863 // See the OldPLABSize comment below, but replace 'after promotion' 2864 // with 'after copying'. YoungPLABSize is the size of the survivor 2865 // space per-gc-thread buffers. The default is 4kw. 2866 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2867 2868 // OldPLABSize is the size of the buffers in the old gen that 2869 // UseParallelGC uses to promote live data that doesn't fit in the 2870 // survivor spaces. At any given time, there's one for each gc thread. 2871 // The default size is 1kw. These buffers are rarely used, since the 2872 // survivor spaces are usually big enough. For specjbb, however, there 2873 // are occasions when there's lots of live data in the young gen 2874 // and we end up promoting some of it. We don't have a definite 2875 // explanation for why bumping OldPLABSize helps, but the theory 2876 // is that a bigger PLAB results in retaining something like the 2877 // original allocation order after promotion, which improves mutator 2878 // locality. A minor effect may be that larger PLABs reduce the 2879 // number of PLAB allocation events during gc. The value of 8kw 2880 // was arrived at by experimenting with specjbb. 2881 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2882 2883 // Enable parallel GC and adaptive generation sizing 2884 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2885 FLAG_SET_DEFAULT(ParallelGCThreads, 2886 Abstract_VM_Version::parallel_worker_threads()); 2887 2888 // Encourage steady state memory management 2889 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2890 2891 // This appears to improve mutator locality 2892 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2893 2894 // Get around early Solaris scheduling bug 2895 // (affinity vs other jobs on system) 2896 // but disallow DR and offlining (5008695). 2897 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2898 2899 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2900 // The last option must always win. 2901 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2902 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2903 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2904 // The last option must always win. 2905 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2906 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2907 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2908 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2909 jio_fprintf(defaultStream::error_stream(), 2910 "Please use CMSClassUnloadingEnabled in place of " 2911 "CMSPermGenSweepingEnabled in the future\n"); 2912 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2913 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2914 jio_fprintf(defaultStream::error_stream(), 2915 "Please use -XX:+UseGCOverheadLimit in place of " 2916 "-XX:+UseGCTimeLimit in the future\n"); 2917 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2918 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2919 jio_fprintf(defaultStream::error_stream(), 2920 "Please use -XX:-UseGCOverheadLimit in place of " 2921 "-XX:-UseGCTimeLimit in the future\n"); 2922 // The TLE options are for compatibility with 1.3 and will be 2923 // removed without notice in a future release. These options 2924 // are not to be documented. 2925 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2926 // No longer used. 2927 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2928 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2929 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2930 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2931 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2932 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2933 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2934 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2935 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2936 // No longer used. 2937 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2938 julong long_tlab_size = 0; 2939 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2940 if (errcode != arg_in_range) { 2941 jio_fprintf(defaultStream::error_stream(), 2942 "Invalid TLAB size: %s\n", option->optionString); 2943 describe_range_error(errcode); 2944 return JNI_EINVAL; 2945 } 2946 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2947 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2948 // No longer used. 2949 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2950 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2951 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2952 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2953 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2954 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2955 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2956 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2957 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2958 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2959 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2960 #if defined(DTRACE_ENABLED) 2961 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2962 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2963 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2964 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2965 #else // defined(DTRACE_ENABLED) 2966 jio_fprintf(defaultStream::error_stream(), 2967 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2968 return JNI_EINVAL; 2969 #endif // defined(DTRACE_ENABLED) 2970 #ifdef ASSERT 2971 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2972 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2973 // disable scavenge before parallel mark-compact 2974 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2975 #endif 2976 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2977 julong cms_blocks_to_claim = (julong)atol(tail); 2978 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2979 jio_fprintf(defaultStream::error_stream(), 2980 "Please use -XX:OldPLABSize in place of " 2981 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2982 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2983 julong cms_blocks_to_claim = (julong)atol(tail); 2984 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2985 jio_fprintf(defaultStream::error_stream(), 2986 "Please use -XX:OldPLABSize in place of " 2987 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2988 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2989 julong old_plab_size = 0; 2990 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2991 if (errcode != arg_in_range) { 2992 jio_fprintf(defaultStream::error_stream(), 2993 "Invalid old PLAB size: %s\n", option->optionString); 2994 describe_range_error(errcode); 2995 return JNI_EINVAL; 2996 } 2997 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2998 jio_fprintf(defaultStream::error_stream(), 2999 "Please use -XX:OldPLABSize in place of " 3000 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3001 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3002 julong young_plab_size = 0; 3003 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3004 if (errcode != arg_in_range) { 3005 jio_fprintf(defaultStream::error_stream(), 3006 "Invalid young PLAB size: %s\n", option->optionString); 3007 describe_range_error(errcode); 3008 return JNI_EINVAL; 3009 } 3010 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3011 jio_fprintf(defaultStream::error_stream(), 3012 "Please use -XX:YoungPLABSize in place of " 3013 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3014 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3015 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3016 julong stack_size = 0; 3017 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3018 if (errcode != arg_in_range) { 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Invalid mark stack size: %s\n", option->optionString); 3021 describe_range_error(errcode); 3022 return JNI_EINVAL; 3023 } 3024 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3025 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3026 julong max_stack_size = 0; 3027 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3028 if (errcode != arg_in_range) { 3029 jio_fprintf(defaultStream::error_stream(), 3030 "Invalid maximum mark stack size: %s\n", 3031 option->optionString); 3032 describe_range_error(errcode); 3033 return JNI_EINVAL; 3034 } 3035 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3036 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3037 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3038 uintx conc_threads = 0; 3039 if (!parse_uintx(tail, &conc_threads, 1)) { 3040 jio_fprintf(defaultStream::error_stream(), 3041 "Invalid concurrent threads: %s\n", option->optionString); 3042 return JNI_EINVAL; 3043 } 3044 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3045 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3046 julong max_direct_memory_size = 0; 3047 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3048 if (errcode != arg_in_range) { 3049 jio_fprintf(defaultStream::error_stream(), 3050 "Invalid maximum direct memory size: %s\n", 3051 option->optionString); 3052 describe_range_error(errcode); 3053 return JNI_EINVAL; 3054 } 3055 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3056 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3057 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3058 // away and will cause VM initialization failures! 3059 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3060 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3061 #if !INCLUDE_MANAGEMENT 3062 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3063 jio_fprintf(defaultStream::error_stream(), 3064 "ManagementServer is not supported in this VM.\n"); 3065 return JNI_ERR; 3066 #endif // INCLUDE_MANAGEMENT 3067 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3068 // Skip -XX:Flags= since that case has already been handled 3069 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3070 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3071 return JNI_EINVAL; 3072 } 3073 } 3074 // Unknown option 3075 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3076 return JNI_ERR; 3077 } 3078 } 3079 3080 // Change the default value for flags which have different default values 3081 // when working with older JDKs. 3082 #ifdef LINUX 3083 if (JDK_Version::current().compare_major(6) <= 0 && 3084 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3085 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3086 } 3087 #endif // LINUX 3088 return JNI_OK; 3089 } 3090 3091 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3092 // This must be done after all -D arguments have been processed. 3093 scp_p->expand_endorsed(); 3094 3095 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3096 // Assemble the bootclasspath elements into the final path. 3097 Arguments::set_sysclasspath(scp_p->combined_path()); 3098 } 3099 3100 // This must be done after all arguments have been processed. 3101 // java_compiler() true means set to "NONE" or empty. 3102 if (java_compiler() && !xdebug_mode()) { 3103 // For backwards compatibility, we switch to interpreted mode if 3104 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3105 // not specified. 3106 set_mode_flags(_int); 3107 } 3108 if (CompileThreshold == 0) { 3109 set_mode_flags(_int); 3110 } 3111 3112 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3113 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3114 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3115 } 3116 3117 #ifndef COMPILER2 3118 // Don't degrade server performance for footprint 3119 if (FLAG_IS_DEFAULT(UseLargePages) && 3120 MaxHeapSize < LargePageHeapSizeThreshold) { 3121 // No need for large granularity pages w/small heaps. 3122 // Note that large pages are enabled/disabled for both the 3123 // Java heap and the code cache. 3124 FLAG_SET_DEFAULT(UseLargePages, false); 3125 } 3126 3127 // Tiered compilation is undefined with C1. 3128 TieredCompilation = false; 3129 #else 3130 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3131 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3132 } 3133 #endif 3134 3135 // If we are running in a headless jre, force java.awt.headless property 3136 // to be true unless the property has already been set. 3137 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3138 if (os::is_headless_jre()) { 3139 const char* headless = Arguments::get_property("java.awt.headless"); 3140 if (headless == NULL) { 3141 char envbuffer[128]; 3142 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3143 if (!add_property("java.awt.headless=true")) { 3144 return JNI_ENOMEM; 3145 } 3146 } else { 3147 char buffer[256]; 3148 strcpy(buffer, "java.awt.headless="); 3149 strcat(buffer, envbuffer); 3150 if (!add_property(buffer)) { 3151 return JNI_ENOMEM; 3152 } 3153 } 3154 } 3155 } 3156 3157 if (!check_vm_args_consistency()) { 3158 return JNI_ERR; 3159 } 3160 3161 return JNI_OK; 3162 } 3163 3164 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3165 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3166 scp_assembly_required_p); 3167 } 3168 3169 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3170 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3171 scp_assembly_required_p); 3172 } 3173 3174 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3175 const int N_MAX_OPTIONS = 64; 3176 const int OPTION_BUFFER_SIZE = 1024; 3177 char buffer[OPTION_BUFFER_SIZE]; 3178 3179 // The variable will be ignored if it exceeds the length of the buffer. 3180 // Don't check this variable if user has special privileges 3181 // (e.g. unix su command). 3182 if (os::getenv(name, buffer, sizeof(buffer)) && 3183 !os::have_special_privileges()) { 3184 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3185 jio_fprintf(defaultStream::error_stream(), 3186 "Picked up %s: %s\n", name, buffer); 3187 char* rd = buffer; // pointer to the input string (rd) 3188 int i; 3189 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3190 while (isspace(*rd)) rd++; // skip whitespace 3191 if (*rd == 0) break; // we re done when the input string is read completely 3192 3193 // The output, option string, overwrites the input string. 3194 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3195 // input string (rd). 3196 char* wrt = rd; 3197 3198 options[i++].optionString = wrt; // Fill in option 3199 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3200 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3201 int quote = *rd; // matching quote to look for 3202 rd++; // don't copy open quote 3203 while (*rd != quote) { // include everything (even spaces) up until quote 3204 if (*rd == 0) { // string termination means unmatched string 3205 jio_fprintf(defaultStream::error_stream(), 3206 "Unmatched quote in %s\n", name); 3207 return JNI_ERR; 3208 } 3209 *wrt++ = *rd++; // copy to option string 3210 } 3211 rd++; // don't copy close quote 3212 } else { 3213 *wrt++ = *rd++; // copy to option string 3214 } 3215 } 3216 // Need to check if we're done before writing a NULL, 3217 // because the write could be to the byte that rd is pointing to. 3218 if (*rd++ == 0) { 3219 *wrt = 0; 3220 break; 3221 } 3222 *wrt = 0; // Zero terminate option 3223 } 3224 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3225 JavaVMInitArgs vm_args; 3226 vm_args.version = JNI_VERSION_1_2; 3227 vm_args.options = options; 3228 vm_args.nOptions = i; 3229 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3230 3231 if (PrintVMOptions) { 3232 const char* tail; 3233 for (int i = 0; i < vm_args.nOptions; i++) { 3234 const JavaVMOption *option = vm_args.options + i; 3235 if (match_option(option, "-XX:", &tail)) { 3236 logOption(tail); 3237 } 3238 } 3239 } 3240 3241 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3242 } 3243 return JNI_OK; 3244 } 3245 3246 void Arguments::set_shared_spaces_flags() { 3247 #ifdef _LP64 3248 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 3249 3250 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3251 // static fields are incorrect in the archive. With some more clever 3252 // initialization, this restriction can probably be lifted. 3253 if (UseCompressedOops) { 3254 if (must_share) { 3255 warning("disabling compressed oops because of %s", 3256 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3257 FLAG_SET_CMDLINE(bool, UseCompressedOops, false); 3258 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false); 3259 } else { 3260 // Prefer compressed oops to class data sharing 3261 if (UseSharedSpaces && Verbose) { 3262 warning("turning off use of shared archive because of compressed oops"); 3263 } 3264 no_shared_spaces(); 3265 } 3266 } 3267 #endif 3268 3269 if (DumpSharedSpaces) { 3270 if (RequireSharedSpaces) { 3271 warning("cannot dump shared archive while using shared archive"); 3272 } 3273 UseSharedSpaces = false; 3274 } 3275 } 3276 3277 // Disable options not supported in this release, with a warning if they 3278 // were explicitly requested on the command-line 3279 #define UNSUPPORTED_OPTION(opt, description) \ 3280 do { \ 3281 if (opt) { \ 3282 if (FLAG_IS_CMDLINE(opt)) { \ 3283 warning(description " is disabled in this release."); \ 3284 } \ 3285 FLAG_SET_DEFAULT(opt, false); \ 3286 } \ 3287 } while(0) 3288 3289 3290 #define UNSUPPORTED_GC_OPTION(gc) \ 3291 do { \ 3292 if (gc) { \ 3293 if (FLAG_IS_CMDLINE(gc)) { \ 3294 warning(#gc " is not supported in this VM. Using Serial GC."); \ 3295 } \ 3296 FLAG_SET_DEFAULT(gc, false); \ 3297 } \ 3298 } while(0) 3299 3300 #if !INCLUDE_ALL_GCS 3301 static void force_serial_gc() { 3302 FLAG_SET_DEFAULT(UseSerialGC, true); 3303 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3304 UNSUPPORTED_GC_OPTION(UseG1GC); 3305 UNSUPPORTED_GC_OPTION(UseParallelGC); 3306 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3307 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3308 UNSUPPORTED_GC_OPTION(UseParNewGC); 3309 } 3310 #endif // INCLUDE_ALL_GCS 3311 3312 // Sharing support 3313 // Construct the path to the archive 3314 static char* get_shared_archive_path() { 3315 char *shared_archive_path; 3316 if (SharedArchiveFile == NULL) { 3317 char jvm_path[JVM_MAXPATHLEN]; 3318 os::jvm_path(jvm_path, sizeof(jvm_path)); 3319 char *end = strrchr(jvm_path, *os::file_separator()); 3320 if (end != NULL) *end = '\0'; 3321 size_t jvm_path_len = strlen(jvm_path); 3322 size_t file_sep_len = strlen(os::file_separator()); 3323 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3324 file_sep_len + 20, mtInternal); 3325 if (shared_archive_path != NULL) { 3326 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3327 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3328 strncat(shared_archive_path, "classes.jsa", 11); 3329 } 3330 } else { 3331 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3332 if (shared_archive_path != NULL) { 3333 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3334 } 3335 } 3336 return shared_archive_path; 3337 } 3338 3339 // Parse entry point called from JNI_CreateJavaVM 3340 3341 jint Arguments::parse(const JavaVMInitArgs* args) { 3342 3343 // Remaining part of option string 3344 const char* tail; 3345 3346 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3347 const char* hotspotrc = ".hotspotrc"; 3348 bool settings_file_specified = false; 3349 bool needs_hotspotrc_warning = false; 3350 3351 const char* flags_file; 3352 int index; 3353 for (index = 0; index < args->nOptions; index++) { 3354 const JavaVMOption *option = args->options + index; 3355 if (match_option(option, "-XX:Flags=", &tail)) { 3356 flags_file = tail; 3357 settings_file_specified = true; 3358 } 3359 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3360 PrintVMOptions = true; 3361 } 3362 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3363 PrintVMOptions = false; 3364 } 3365 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3366 IgnoreUnrecognizedVMOptions = true; 3367 } 3368 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3369 IgnoreUnrecognizedVMOptions = false; 3370 } 3371 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3372 CommandLineFlags::printFlags(tty, false); 3373 vm_exit(0); 3374 } 3375 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3376 #if INCLUDE_NMT 3377 MemTracker::init_tracking_options(tail); 3378 #else 3379 jio_fprintf(defaultStream::error_stream(), 3380 "Native Memory Tracking is not supported in this VM\n"); 3381 return JNI_ERR; 3382 #endif 3383 } 3384 3385 3386 #ifndef PRODUCT 3387 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3388 CommandLineFlags::printFlags(tty, true); 3389 vm_exit(0); 3390 } 3391 #endif 3392 } 3393 3394 if (IgnoreUnrecognizedVMOptions) { 3395 // uncast const to modify the flag args->ignoreUnrecognized 3396 *(jboolean*)(&args->ignoreUnrecognized) = true; 3397 } 3398 3399 // Parse specified settings file 3400 if (settings_file_specified) { 3401 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3402 return JNI_EINVAL; 3403 } 3404 } else { 3405 #ifdef ASSERT 3406 // Parse default .hotspotrc settings file 3407 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3408 return JNI_EINVAL; 3409 } 3410 #else 3411 struct stat buf; 3412 if (os::stat(hotspotrc, &buf) == 0) { 3413 needs_hotspotrc_warning = true; 3414 } 3415 #endif 3416 } 3417 3418 if (PrintVMOptions) { 3419 for (index = 0; index < args->nOptions; index++) { 3420 const JavaVMOption *option = args->options + index; 3421 if (match_option(option, "-XX:", &tail)) { 3422 logOption(tail); 3423 } 3424 } 3425 } 3426 3427 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3428 jint result = parse_vm_init_args(args); 3429 if (result != JNI_OK) { 3430 return result; 3431 } 3432 3433 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3434 SharedArchivePath = get_shared_archive_path(); 3435 if (SharedArchivePath == NULL) { 3436 return JNI_ENOMEM; 3437 } 3438 3439 // Delay warning until here so that we've had a chance to process 3440 // the -XX:-PrintWarnings flag 3441 if (needs_hotspotrc_warning) { 3442 warning("%s file is present but has been ignored. " 3443 "Run with -XX:Flags=%s to load the file.", 3444 hotspotrc, hotspotrc); 3445 } 3446 3447 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3448 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3449 #endif 3450 3451 #if INCLUDE_ALL_GCS 3452 #if (defined JAVASE_EMBEDDED || defined ARM) 3453 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3454 #endif 3455 #endif 3456 3457 #ifndef PRODUCT 3458 if (TraceBytecodesAt != 0) { 3459 TraceBytecodes = true; 3460 } 3461 if (CountCompiledCalls) { 3462 if (UseCounterDecay) { 3463 warning("UseCounterDecay disabled because CountCalls is set"); 3464 UseCounterDecay = false; 3465 } 3466 } 3467 #endif // PRODUCT 3468 3469 // JSR 292 is not supported before 1.7 3470 if (!JDK_Version::is_gte_jdk17x_version()) { 3471 if (EnableInvokeDynamic) { 3472 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3473 warning("JSR 292 is not supported before 1.7. Disabling support."); 3474 } 3475 EnableInvokeDynamic = false; 3476 } 3477 } 3478 3479 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3480 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3481 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3482 } 3483 ScavengeRootsInCode = 1; 3484 } 3485 3486 if (PrintGCDetails) { 3487 // Turn on -verbose:gc options as well 3488 PrintGC = true; 3489 } 3490 3491 if (!JDK_Version::is_gte_jdk18x_version()) { 3492 // To avoid changing the log format for 7 updates this flag is only 3493 // true by default in JDK8 and above. 3494 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3495 FLAG_SET_DEFAULT(PrintGCCause, false); 3496 } 3497 } 3498 3499 // Set object alignment values. 3500 set_object_alignment(); 3501 3502 #if !INCLUDE_ALL_GCS 3503 force_serial_gc(); 3504 #endif // INCLUDE_ALL_GCS 3505 #if !INCLUDE_CDS 3506 if (DumpSharedSpaces || RequireSharedSpaces) { 3507 jio_fprintf(defaultStream::error_stream(), 3508 "Shared spaces are not supported in this VM\n"); 3509 return JNI_ERR; 3510 } 3511 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3512 warning("Shared spaces are not supported in this VM"); 3513 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3514 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3515 } 3516 no_shared_spaces(); 3517 #endif // INCLUDE_CDS 3518 3519 // Set flags based on ergonomics. 3520 set_ergonomics_flags(); 3521 3522 set_shared_spaces_flags(); 3523 3524 // Check the GC selections again. 3525 if (!check_gc_consistency()) { 3526 return JNI_EINVAL; 3527 } 3528 3529 if (TieredCompilation) { 3530 set_tiered_flags(); 3531 } else { 3532 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3533 if (CompilationPolicyChoice >= 2) { 3534 vm_exit_during_initialization( 3535 "Incompatible compilation policy selected", NULL); 3536 } 3537 } 3538 3539 set_heap_base_min_address(); 3540 3541 // Set heap size based on available physical memory 3542 set_heap_size(); 3543 3544 #if INCLUDE_ALL_GCS 3545 // Set per-collector flags 3546 if (UseParallelGC || UseParallelOldGC) { 3547 set_parallel_gc_flags(); 3548 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3549 set_cms_and_parnew_gc_flags(); 3550 } else if (UseParNewGC) { // skipped if CMS is set above 3551 set_parnew_gc_flags(); 3552 } else if (UseG1GC) { 3553 set_g1_gc_flags(); 3554 } 3555 check_deprecated_gcs(); 3556 check_deprecated_gc_flags(); 3557 if (AssumeMP && !UseSerialGC) { 3558 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3559 warning("If the number of processors is expected to increase from one, then" 3560 " you should configure the number of parallel GC threads appropriately" 3561 " using -XX:ParallelGCThreads=N"); 3562 } 3563 } 3564 #else // INCLUDE_ALL_GCS 3565 assert(verify_serial_gc_flags(), "SerialGC unset"); 3566 #endif // INCLUDE_ALL_GCS 3567 3568 // Set bytecode rewriting flags 3569 set_bytecode_flags(); 3570 3571 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3572 set_aggressive_opts_flags(); 3573 3574 // Turn off biased locking for locking debug mode flags, 3575 // which are subtlely different from each other but neither works with 3576 // biased locking. 3577 if (UseHeavyMonitors 3578 #ifdef COMPILER1 3579 || !UseFastLocking 3580 #endif // COMPILER1 3581 ) { 3582 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3583 // flag set to true on command line; warn the user that they 3584 // can't enable biased locking here 3585 warning("Biased Locking is not supported with locking debug flags" 3586 "; ignoring UseBiasedLocking flag." ); 3587 } 3588 UseBiasedLocking = false; 3589 } 3590 3591 #ifdef CC_INTERP 3592 // Clear flags not supported by the C++ interpreter 3593 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3594 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3595 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3596 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3597 #endif // CC_INTERP 3598 3599 #ifdef COMPILER2 3600 if (!UseBiasedLocking || EmitSync != 0) { 3601 UseOptoBiasInlining = false; 3602 } 3603 if (!EliminateLocks) { 3604 EliminateNestedLocks = false; 3605 } 3606 if (!Inline) { 3607 IncrementalInline = false; 3608 } 3609 #ifndef PRODUCT 3610 if (!IncrementalInline) { 3611 AlwaysIncrementalInline = false; 3612 } 3613 #endif 3614 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3615 // incremental inlining: bump MaxNodeLimit 3616 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3617 } 3618 #endif 3619 3620 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3621 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3622 DebugNonSafepoints = true; 3623 } 3624 3625 #ifndef PRODUCT 3626 if (CompileTheWorld) { 3627 // Force NmethodSweeper to sweep whole CodeCache each time. 3628 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3629 NmethodSweepFraction = 1; 3630 } 3631 } 3632 #endif 3633 3634 if (PrintCommandLineFlags) { 3635 CommandLineFlags::printSetFlags(tty); 3636 } 3637 3638 // Apply CPU specific policy for the BiasedLocking 3639 if (UseBiasedLocking) { 3640 if (!VM_Version::use_biased_locking() && 3641 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3642 UseBiasedLocking = false; 3643 } 3644 } 3645 3646 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3647 // but only if not already set on the commandline 3648 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3649 bool set = false; 3650 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3651 if (!set) { 3652 FLAG_SET_DEFAULT(PauseAtExit, true); 3653 } 3654 } 3655 3656 return JNI_OK; 3657 } 3658 3659 jint Arguments::adjust_after_os() { 3660 #if INCLUDE_ALL_GCS 3661 if (UseParallelGC || UseParallelOldGC) { 3662 if (UseNUMA) { 3663 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3664 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3665 } 3666 // For those collectors or operating systems (eg, Windows) that do 3667 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3668 UseNUMAInterleaving = true; 3669 } 3670 } 3671 #endif // INCLUDE_ALL_GCS 3672 return JNI_OK; 3673 } 3674 3675 int Arguments::PropertyList_count(SystemProperty* pl) { 3676 int count = 0; 3677 while(pl != NULL) { 3678 count++; 3679 pl = pl->next(); 3680 } 3681 return count; 3682 } 3683 3684 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3685 assert(key != NULL, "just checking"); 3686 SystemProperty* prop; 3687 for (prop = pl; prop != NULL; prop = prop->next()) { 3688 if (strcmp(key, prop->key()) == 0) return prop->value(); 3689 } 3690 return NULL; 3691 } 3692 3693 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3694 int count = 0; 3695 const char* ret_val = NULL; 3696 3697 while(pl != NULL) { 3698 if(count >= index) { 3699 ret_val = pl->key(); 3700 break; 3701 } 3702 count++; 3703 pl = pl->next(); 3704 } 3705 3706 return ret_val; 3707 } 3708 3709 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3710 int count = 0; 3711 char* ret_val = NULL; 3712 3713 while(pl != NULL) { 3714 if(count >= index) { 3715 ret_val = pl->value(); 3716 break; 3717 } 3718 count++; 3719 pl = pl->next(); 3720 } 3721 3722 return ret_val; 3723 } 3724 3725 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3726 SystemProperty* p = *plist; 3727 if (p == NULL) { 3728 *plist = new_p; 3729 } else { 3730 while (p->next() != NULL) { 3731 p = p->next(); 3732 } 3733 p->set_next(new_p); 3734 } 3735 } 3736 3737 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3738 if (plist == NULL) 3739 return; 3740 3741 SystemProperty* new_p = new SystemProperty(k, v, true); 3742 PropertyList_add(plist, new_p); 3743 } 3744 3745 // This add maintains unique property key in the list. 3746 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3747 if (plist == NULL) 3748 return; 3749 3750 // If property key exist then update with new value. 3751 SystemProperty* prop; 3752 for (prop = *plist; prop != NULL; prop = prop->next()) { 3753 if (strcmp(k, prop->key()) == 0) { 3754 if (append) { 3755 prop->append_value(v); 3756 } else { 3757 prop->set_value(v); 3758 } 3759 return; 3760 } 3761 } 3762 3763 PropertyList_add(plist, k, v); 3764 } 3765 3766 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3767 // Returns true if all of the source pointed by src has been copied over to 3768 // the destination buffer pointed by buf. Otherwise, returns false. 3769 // Notes: 3770 // 1. If the length (buflen) of the destination buffer excluding the 3771 // NULL terminator character is not long enough for holding the expanded 3772 // pid characters, it also returns false instead of returning the partially 3773 // expanded one. 3774 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3775 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3776 char* buf, size_t buflen) { 3777 const char* p = src; 3778 char* b = buf; 3779 const char* src_end = &src[srclen]; 3780 char* buf_end = &buf[buflen - 1]; 3781 3782 while (p < src_end && b < buf_end) { 3783 if (*p == '%') { 3784 switch (*(++p)) { 3785 case '%': // "%%" ==> "%" 3786 *b++ = *p++; 3787 break; 3788 case 'p': { // "%p" ==> current process id 3789 // buf_end points to the character before the last character so 3790 // that we could write '\0' to the end of the buffer. 3791 size_t buf_sz = buf_end - b + 1; 3792 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3793 3794 // if jio_snprintf fails or the buffer is not long enough to hold 3795 // the expanded pid, returns false. 3796 if (ret < 0 || ret >= (int)buf_sz) { 3797 return false; 3798 } else { 3799 b += ret; 3800 assert(*b == '\0', "fail in copy_expand_pid"); 3801 if (p == src_end && b == buf_end + 1) { 3802 // reach the end of the buffer. 3803 return true; 3804 } 3805 } 3806 p++; 3807 break; 3808 } 3809 default : 3810 *b++ = '%'; 3811 } 3812 } else { 3813 *b++ = *p++; 3814 } 3815 } 3816 *b = '\0'; 3817 return (p == src_end); // return false if not all of the source was copied 3818 }